| Wüsthof — the marks Dreizackwerk / Gladiatorwerk (Solingen) | the firm appears in the directories of 1925 and 1932; the source does not print mark registration years | 3 | For Wüsthof the source does NOT print mark registration years (unlike Puma and Henckels): there is only a list of marks and the years in which the fir |
| Country mark (lower bound, NOT a year) | the requirement applies from 1 March 1891 (Tariff Act of 1890, also known as the McKinley Tariff) | 2 | A country mark is only a LOWER BOUND (the item is no earlier than the introduction of the marking) and never a year. For Wüsthof the mark GERMANY is a |
| Grind, spine, scales, etching — era markers of a straight razor | 1700s → mid-1900s | 16 | Shared layer for all straight razors: it does not date precisely, but it cuts off an era. All rows are printed wordings from a shop-page guide review |