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Dear Sir/Madam, I recently acquired my '10-B' from a goodwill store in Queensland Australia where I reside. I'm a little 'gobsmacked' about the apparent age of this instrument: roughly the same age as my parents (!). On this instrument the 'table of equivalents & conversions' was replaced by a smaller table of 'scales appropriate to functions' and a reminder that commonsense should be used in determining the position of the decimal point with respect to the result.. The cursor appears to be clear celluloid (?) framed by nickel-plated brass. There is no obvious warping of the wood in any plane and the scales are in exquisite condition. The box it travelled in is in 'good nick' and was open at the top. Was there ever a cap? Presumably so... I had hoped to find an engineer's slide rule circa late 1960's and found this instead. A little like searching for a rifle and finding a musket haha. Sobering to think that this humble piece of Buxus has survived where countless artifacts haven't, and indeed where countless humans have shuffled 'on stage', delivered their lines and shuffled off 'stage left'. A moment's silence on that thought. I fully intend to master the use of my 'new' EMP-proof computational instrument. Another three decades of occasional use isn't out of the question. This would take it up to it's centenary... In numero veritas,