| Faber-Castell 57/92 (variation 1) | |
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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 | 10 |
| Country of origin | United Kingdom |
| Country of manufacturing | Germany |
| Year of manufacturing | August 1955 |
| Status of the slide rule | Normal signs of use |
| Material of the slide rule | Plastic |
| Type of cursor | Clear plastic |
| Status of the box | Normal signs of use |
| Status of the manual | None |
| Collection number | 89 |
| Faber-Castell 57/92 (variation 2) | |
| Back of the slide | |
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| Pouch | |
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| Year of manufacturing | 1966 |
| Country of origin | United Kingdom |
| Comments | This version is 10 years older and differs in 2 aspects. The back of the slide is slightly different. It comes in a real leather pouch, which is most likely not an original Faber-Castell product. Inside the leather pouch is written: D.J. Walker, 12 Guilsborough, Willisden". |
| Faber-Castell 57/92 (variation 3) | |
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Front |
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Box |
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| Length | 29 cm |
| Number of scales | 10 |
| Country of origin | United Kingdom |
| Country of manufacturing | Germany |
| Year of manufacturing | 1968 |
| Status of the slide rule | Normal signs of use |
| Material of the slide rule | Plastic |
| Type of cursor | Clear plastic |
| Status of the box | Normal signs of use |
| Status of the manual | Normal signs of use (English) |
| Collection number | 162 |
| Comments | Some significant changes were made to enhance the readibility of this slide rule between 1966 and 1968. |
