| Faber-Castell 391 | |
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Front |
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Back |
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Front without slide |
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| Back of the slide | |
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Box |
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| Length | 29 cm |
| Number of scales | 9 |
| Country of origin | Germany |
| Country of manufacturing | Germany |
| Year of manufacturing | 1933 |
| Status of the slide rule | Near mint |
| Material of the slide rule | Celluloid on wood |
| Type of cursor | Aluminium wiht glass |
| Status of the box | Normal signs of use |
| Type of box | Black cardboard |
| Status of the manual | |
| Collection number | 219 |
| Further comments | Not shown of the photos is a cm scale on the top of the slide rule and a 1:25 scale on the bottom. |
