ITEM DESCRIPTION:

Being offered for sale is the vintage KEUFFEL & ESSER CO. SLIDE RULE (with original high-end sewed orange leather case, original paper insert AND original cardboard box! - PLEASE SEE BELOW FOR MORE INFORMATION ON THIS PARTICULAR MODEL SLIDE RULE) No. N4053-3 (unusual intermediate style with re-adoption of the "0" mark on the centimeter ruler edge - see below for more info) from circa 1937-1940 (as per info found at sliderule.ca (again, see below)), as seen in the pictures/as described in the title. PLEASE SEE BELOW FOR IMPORTANT CONDITION NOTES. Being offered for sale as-found, uncleaned. May require a thorough detailing to bring to its full potential.

SATISFACTION GUARANTEED or your money back...no questions asked!

ADDITIONAL INFORMATION FOUND AT SLIDERULE.CA:

A very unusual intermediate rule! Although very similar to the model shown above, there are a few interesting modifications. First, the cursor now has that standard 1937 patent number (which is seen on these rules from this time forward). Secondly, the log scale on the reverse of the slider now goes from zero to one (in decimal units), instead of from zero to 10 (marked by integers), as shown on earlier rules. The strangest change, however, is the re-adoption of the "0" mark on the centimeter ruler edge. I have not seen this mark on any other rule from this time period, and it was definitely gone again by the 1942 model shown below. A very bizarre (and short-lived) re-tooling obviously occurred around this time. In any case, the patina of this particular specimen is still incredibly white for its age, and everything is in excellent shape. The case is the high-end sewed orange leather type with chamois interior, although now with the closing flap bolted on instead of stitched (with a patent date of 1935 on the metal end pieces). As for cost, I know from the 1937 K&E catalog price list that this model was now up to $7.00 in the plain case, and $7.80 in leather. An unusual example of the latter type N4053-3, sporting the best cursor design and highest quality case.

CONDITION NOTES:

Excellent, virtually new-old-stock condition with hardly a blemish! Original celluloid is extremely white for its age (most are discolored by now). Both leather case and paper insert are pristine. This is one fantastic example!! See pics.

DIMENSIONS & WEIGHT:

10" long model. Please see ruler in pictures for size/scale reference. Additional measurements shall be provided upon request.

Total weight in box is 6.8 oz..

GENERAL NOTE: If you are viewing this on a mobile phone or tablet and the pictures are blurry when you zoom in, be sure to check that your browser is set to "Full Website Version", as the mobile browsers often reduce image quality in favor of speed. Our pictures are high resolution and always in focus. Best viewed using a computer with a nice big monitor.