Thatcher Calculator K & E Keuffel & Esser #4014 Pocket Watch Calculator / Slide Rule
Larry & Carole Meeker
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      Antique Dealers & Brokers

Purveyors and Dealers of Americana  /  Patented & Mechanical Antiques

Slide Rules, Calculators
& Other Scientific Related Antiques

We Can Help You Sell Your Antique & CollectibleFuller Calculator / Circular Slide Rule Slide Rules and Calculation Devices!

Please Contact me with any early and unusual slide rule that you have for sale. 

This site, is our informational and past sales results website. There are links on the left to other informational pages, and on the right, links to past sales results for antiques & Collectibles that we have sold.

Our antique sales website for these and other types of antiques and collectibles is  Please visit that site if you are looking to buy these types of antiques and collectibles .

Please contact us by email at if you have any interesting technological or scientific related antiques you want to sell.


Below are some pictures of the types of scientific antiques and vintage calculation devices and slide rules that we deal in and are seeking, along with some basic information to help you determine what you have. I am an active antique dealer interested in antique and K & E Webb Stadia Rule / Circular Sliderule collectible slide rules and other calculation devices that date from the early 20th century and before.  This page is a basic primer describing the different and various types of scientific and calculation devices we buy, sell, deal in, and can help you sell. 

Slide Rules

A Basic K & E Slide Rule Cursor Lesson or Beginning Primer for the Curious

The next three pictures give views of different early cursors (the sliding window portion) employed by Keuffel & Esser or K & E and  represent the transition or changes that slide rule cursors have gone through.  This is by no means the full story, and there are variations and other designs by other companies that are not covered here. 

The first picture of the all brass cursor on the right is referred to as the Christmas tree or chisel point cursor. This style cursor is considered the first model K & E used and dates from a bit before to near the turn of the 20th century.  It is rare and desirable. It can cause what is otherwise a $10.00 sliderule to sell for several hundred to $1000.00 or more.1st model Slide Rule cursor  It has no glass window like later model slide rule cursors do.  You would work off of one of the tips to do your calculations.  Some are like this one with the points going out to just one side and other K & E cursors have points on both sides of the center post or upright.   

The second clam shell cursor picture shows what is known as a clamshell cursor.  This was the second cursor employed by K & E. Some examples are pretty rare, others on common rules, are not.  

The clamshell design was replaced by the interesting looking and difficult to find column column cursor which is pictured below on the right.   The K & E Slide Rule column cursors still show in the 1913 catalogs, but were phased out shortly after that.  This cursor style was only used for a few short years and affects the value upward for most examples to levels in the hundreds of dollars on what would otherwise be a $10.00 - $20.00 rule.

K & E kept extensive records of their production and through research it is pretty well known how many of each type of cursor was offered and by scanning through the early catalogs when the cursor style changed and what models were offered when. 

The next cursor to be used after the column cursor was the short lived frameless cursor.   (not pictured here) This design was an attempt to save money and material and give the slide rule cursorK & E Column Cursor a sleeker look over the earlier designs.  It was a disaster as they were very fragile and prone to break at the connection points in the corners that had holes drilled through the glass.  This style cursor does not add much of  premium even though it is hard to find them not broken or damaged.

K & E shortly thereafter introduced the standard framed cursor that most slide rules found today have.  After K & E introduced their standard framed cursor, that basic design was used until production of slide rules ended in the late 60's or early 70's.

Slide Rules Wanted

I am interested in any slide rule with one of these early cursors pictured, or slide rules with any other K& E / Keuffel & Esser 4088-2SM Slide Ruleunusual cursors that some other companies used.  Some of these had small decimal keepers or counters on them, or moveable arrows, or in one case a small abacus to help you along with your calculations and in keeping track of where the decimal point belonged. Some also had magnifiers built into the cursor.  K & E offered clip on magnifiers. 

I am also interested in any special use slide rules. Slides Rules with scales especially designed for surveying, chemicals, electrical calculations, aviation, and others are sought. There were many slide rules produced to help the scientist, machinist, shopkeeper, workers and others with the daily computations that they were faced with in performing their jobs.

Slide rules are an emerging collector category, and different folks collect them for different reasons.   Each of these groups feels that different ones are worth different amounts for different reasons.  If that seems confusing, it is, and prices and supposed values of these interesting collectables fluctuate wildly depending on which group you are listening to.  

Slide Rule Values

The first picture is of a relatively common but very collectable slide rule put out by K & E or Keuffel & Esser.  It is known as Decilon Slide Rule the Deci-Lon and was one of the last sliderules K & E  made or offered.  It is all plastic and was produced for a number of years, with the last models being designated by the model number 68-1100.  Before the Internet and the beginning of their "known" or documented popularity this rule could be had routinely for $20 or less and was routinely passed over by collectors and those in  the "know" who were looking for earlier and rarer examples of slide rules.  Today  this rule routinely brings $100 or so, not because they are scarce, but rather because they are popular. The 5" version sells for even more for the same reasons.  The collecting frenzy over them and the resulting prices they bring is largely driven by the same impulse that has created a desire for collectibles like GI Joes and Barbie dolls, that being the current generation buying back their childhood, rather than anything resembling scarcity or the historical significance associated with them.

The point is that there are many earlier and somewhat rarer slide rules that are not having a lot of attention paid to them these days circular slide rulethat have potential to be worth more in the long run, and these are the rules that I am interested in.

Please Contact me with any early and unusual slide rule that you have.  I can help you with it.  On our sister site  I have a good sampling of slide rules available for sale.  Please visit that site if you are looking to buy slide rules.

I am also interested in other scientific or technology related antiques, including surveying instruments, other early calculation devices and early patented adders that date from the 19th century and into the early 20th century as well as a host of other related antiques. Please see those other pages in the left column to see or read more. I have many past sales results in the past sales archives that can be accessed through the link in the right column.

To see examples of many slide rules and calculators I have sold in the past please go to the Past Sales Results Archive.

To see examples of similar antiques that we currently have for sale please go to our sister site at and visit the numerous sale pages you will find there. 

Thank you!!
Larry & Carole

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Larry & Carole Meeker