| Camera No. | 20/01 | 20/02 | 20/03 |
| Camera Name | Keystone Camera | Keystone Camera | Keystone Pathfinder |
| Film Size | 8mm | 8mm | 8mm |
| Film Type | Double-8 | Double-8 | Double-8 |
| Model | K-8 | K-8 | K-29 |
| Camera Maker | Keystone Mfg. Co. | Keystone Mfg. Co. | Keystone |
| Location | Boston Mass | Boston Mass. | Hallet Sq Boston 24 Mass |
| Made in | usa | usa | usa |
| Serial No. | 862000 | 981612 | 584676 |
| Lens | Wollensak f3.5 CINE VELOSTIGMAT | Wollensak 1/2 inch f/2.5 CINE RAPTAR | Keystone-Elgeet 1/2" f:2.8 |
| Mechanism | spring not work | Spring not work | spring works |
| Condition | *** | *** | ***** |
| Container | original box | original box | original box |
| Additonal Parts | wrist handle | wrist strap / film spool | wrist handle / loaded film spool |
| Lightmeter | N/A | N/A | N/A |
| Features | loading label | loading instr label | loading label |
| Patent No. | 2 082 505 | 2 082 505 2 168 941 | 2 082 505 | 20/13 | Stewart-Warner Buddy 8 | 8mm | Double-8 | 532-A | Stewart-Warner | Chicago | usa | 12960 | Wollensak VELOSTIGMAT f1.9 | spring works | ***** | original wood case | wrist strap | N/A | very similar to Keystone 20/01 | PENDING |