Case XX 4100 Citrus Tester knife price guide
Be sure to check out the W.R. Case pocket knives up for sale in the AAPK member store when you get finished with the knife value guides!
| Year | Pattern Number | Handle Description | Other Discerning Features | Estimated Market Value |
| 4100 SS | white composite | serrated blade | $850.00 | |
| 4100 SS | white composite | large stamp | $240.00 | |
| 4200 SS | white composite | no | $155.00 | |
| 4200 SS | white composite | no | $205.00 | |
| 4200 SS | white composite | no | $195.00 | |
| 4200 SS | white composite | no | $240.00 | |
| 4200 SS | white composite | no | $150.00 | |
| 1959- 1964 | 4100 SS | white composite | no | $205.00 |
| 1965 - 1969 | 4100 SS | white composite | small stamp | $225.00 |
| 1970 | 4100 SS | white composite | no | $250.00 |
| 1971 | 4100 SS | white composite | no | $96.00 |
| 1971 | 4200 SS | white composite | no | $160.00 |
| 1973 | 4100 SS | white composite | no | $98.00 |
| 1974 | 4100 SS | white composite | no | $92.00 |
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