Catalog
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| Location | Switzerland (1848-date) |
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| Year | |
| Type | Log in to see details |
| Composition | Log in to see details |
| Weight | Log in to see details |
| Diameter | Log in to see details |
| Thickness | Log in to see details |
| Shape | Round |
| Technique | Log in to see details |
| Orientation | Log in to see details |
| Edge | Log in to see details |
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| Notice | Log in to see details |
| Reference(s) | Log in to see details |
| Obverse description | The central field bears the issuer name 'JH Keller AG / Zürich' in raised relief lettering. A circular legend around the rim reads 'Vulkanstrasse 120 · Zürich-Altstetten', identifying the business address of the issuing company. |
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| Obverse script | Log in to see details |
| Obverse lettering | Log in to see details |
| Reverse description | The central field displays the brand name 'HYPROMAT' within a rectangular frame, with the denomination '1.-' in large numerals below, and the issuer name 'J.H. Keller AG' within a second rectangular frame at the bottom. A circular legend around the rim reads 'Selbstbedienungs-Waschzentrum für alle Fahrzeuge bis 3,5t', indicating use at a self-service vehicle washing centre. |
| Reverse script | Latin |
| Reverse lettering | Log in to see details |
| Mint | Log in to see details |
| Mintage | Log in to see details |
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