| A/R - Serial number range: 200000-270000. | Total production: 70000 |
| KR - Serial number range: 200404-265771. | Total production: 65367 |
| Known Versions | ||
| A/R Version | KR Serial Range | Changes Between Versions |
| 200404-204592 | Rectangular recess in baseplate, horizontally mounted bracket (750-000.10) for the sprocket shaft. "Q1" embossed on leatherette. | |
| 1 | 206479-264222 | Baseplate with circular recess. |
| 261243-265771 | Inside body casting is different shape with a vertically mounted bracket (750-000.39) for the now shorter sprocket shaft. | |