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 Prices of popular models of slide rules The following table gives the price of some popular slide rules. The table is based on rules sold on ebay from July 2000 to June 2001 inclusive. I have only included rules where at least 5 were sold. For all rules included I give the median price (half the rules cost more and half cost less than median). To give an idea of the range of prices, where more than ten rules were sold, I give the upper and lower quartile prices (25% of rules were more expensive than the upper quartile and 25% were less expensive than the lower quartile). A separate, tentative, analysis suggests that prices of the top 10% sales of a particular are around 1.8 times higher than the median and the top 5% are around 2.5 times higher than the median. The cheapest examples of a particular model are about 0.5 times the median. Model Number sold Upper quartile Median Lower quartile Acu Math 400 63 \$8 \$5 \$3 Concise 28 56 \$21 \$16 \$13 Dietzgen 1734 43 \$75 \$51 \$39 Dietzgen 1738 12 \$37 \$21 \$17 Dietzgen 1767 40 \$10 \$7 \$5 Faber Castell 2/83N 53 \$230 \$163 \$108 Faber Castell 57/87 21 \$21 \$18 \$11 Faber Castell 57/88 24 \$39 \$31 \$25 Faber Castell 62/83N 9 \$179 Fuller 24 \$1,502 \$802 \$384 Keuffel and Esser 4053-3 Polyphase 242 \$26 \$13 \$8 Keuffel and Esser 4081-3 207 \$35 \$21 \$15 Keuffel and Esser 4081-5 9 \$250 Keuffel and Esser 68 1100 Decilon 176 \$148 \$92 \$66 Keuffel and Esser 68 1215 Decitrig 154 \$41 \$26 \$19 Otis King 74 \$200 \$138 \$106 Pickett 120 188 \$10 \$8 \$4 Pickett 140 48 \$10 \$8 \$6 Pickett 160 31 \$15 \$10 \$6 Pickett 200 59 \$19 \$14 \$11 Pickett 400 15 \$26 \$21 \$14 Pickett 600 118 \$33 \$23 \$19 Pickett 902 200 \$15 \$10 \$6 Pickett 903 24 \$13 \$11 \$9 Pickett 904 10 \$34 Post 1447 126 \$13 \$9 \$6 Post Versalog 1460 171 \$51 \$38 \$30 Post Versalog 1461 20 \$113 \$92 \$88 Sterling 594 Decimal Trig Log-log 65 \$10 \$9 \$5

Notes.

1. The prices are based on a computerised analysis of completed sales information from ebay. Given the varying formats used by sellers it is possible that not all sales of a particular model have been included. It is also possible the rules sold without model number would have been included had it been given.

2. I tried analysing separately sales where phrases indicating condition, such a "Mint in box" or "MIB", or completeness, such as "in case with instructions", were used but with the relatively small number of sales of each model there was little consistency in the results.

3. Sellers sometimes sell a group of rules as a single lot or sell instruction books for a particular model. By limiting myself to the range between the upper and lower quartiles, most of the these would be excluded.