| Concise |
| Description | Price | Date | Bids |
Prices of slide rules sold on ebay (the internet auction) in Mar-2005 |
| Sama & Etani Concise Circular Slide Rule Perio | $102.50 | 04-Mar-2005 | 17 |
| Concise circular slide rule - smallest I've ev | $51.87 | 06-Mar-2005 | 5 |
| Shell Oil circular slide rule Concise Model 60 | $47.17 | 22-Mar-2005 | 11 |
| CONCISE (Sama & Etani CTCS-552) Circular Slide | $31.51 | 18-Mar-2005 | 8 |
| Concise Circular Slide Rule Sama & Etani Excel | $31.00 | 22-Mar-2005 | 4 |
| CONCISE CIRCULAR SLIDE RULE #300 WITH CASE AND | $24.50 | 04-Mar-2005 | 9 |
| CONCISE CIRCULAR SLIDE RULE # 300 | $23.05 | 30-Mar-2005 | 6 |
| OLD CONCISE SLIDE RULE CIRCULAR no 270n | $20.50 | 18-Mar-2005 | 7 |
| CONCISE CTCS 552 SLIDE RULE ELEMENTS BROWN & R | $20.50 | 14-Mar-2005 | 6 |
| Vintage Concise #28N Circular Slide Rule | $18.00 | 23-Mar-2005 | 11 |
| ROUND CONCISE SLIDE RULE CIRCULAR SLIDE RULE | $16.10 | 06-Mar-2005 | 3 |
| Vintage Concise Circular Slide Rule No. 28N NR | $16.00 | 20-Mar-2005 | 7 |
| CATERPILLAR Give-Away - CONCISE Circular SLIDE | $15.00 | 10-Mar-2005 | 1 |
| Concise circular slide rule w/case + instr | $12.03 | 25-Mar-2005 | 3 |
| Vintage Concise Circular Slide Rule No. 28 N | $12.00 | 23-Mar-2005 | 1 |
| CONCISE Model Alpha 4048 Circular Slide Rule | $11.50 | 21-Mar-2005 | 2 |
| rare japanese circular slide rule CONCISE CTCS | $10.50 | 06-Mar-2005 | 2 |
| Concise 300 Slide Rule with Case and Instructi | $10.49 | 02-Mar-2005 | 2 |
| VINTAGE CONCISE CIRCULAR SLIDE RULE NUMBER 28 | $8.00 | 20-Mar-2005 | 4 |
| CONCISE CIRCULAR SLIDE RULE # 28 NICE CONDITIO | $6.50 | 20-Mar-2005 | 2 |
| old CONCISE Circular Slide Rule w/Conv Tables | $6.00 | 07-Mar-2005 | 5 |
| CONCISE Conversion Tables Circular Slide Rule- | $4.25 | 19-Mar-2005 | 3 |
| Concise circular slide rule w/case + instr | $20.00 | 10-Mar-2005 | 0 |
| Concise circular slide rule w/case + instr | $18.00 | 18-Mar-2005 | 0 |
| Concise circular slide rule w/case + instr | $15.00 | 22-Mar-2005 | 0 |
| Concise circular slide rule w/case + instr | $15.00 | 19-Mar-2005 | 0 |
| 1950s American Standard Concise Circular Slide | $9.99 | 09-Mar-2005 | 0 |
| CONCISE Model Alpha 4048 Circular Slide Rule | $5.00 | 16-Mar-2005 | 0 |