Pickett N525-ES StatRule
(click for larger images.)
SCALES FRONT and BACK:
I picked this up at eBay for $35 (ruler and case only). The NIB (New In Box) ones usually go for about $75, so I figured this would go for a bit more than $35. After all, it's not just a slide rule... it's a slide rule that does statistics! Then again, slide rule collecting is already at the outer extremes of geekiness -- maybe combining slide rules and statistics is something that goes beyond the pale (geekily speaking.)
The friggen' over-honest seller who sold me this marked it as "merchandise" on the customs form, rather than "other" or "gift" or "sample" like all the other sellers do. As a result, I was dinged by the postal carrier with an extra $7 for duty and taxes. Grrr. I had to go down to the front desk to pay, and some coworkers hanging around were stunned that I (A) had purchased an actual slide rule, and (B) that I already owned more than one. I'd say that "slack-jawed bewilderment" is an accurate description of their expressions.
The rule didn't come with a manual; fortunately, one of the kind people over at the International Slide Rule Group, Ron Knapp, scanned his copy and emailed it to me.
Here are all the pages of the manual in GIF format, collected into a zip file: pickett-525-manual.zip (4.4 MB).
UPDATE: the StatRule has been virtualized!