| Frederick Reynolds — the stamp and address eras (1830 → the 1870s) | c. 1830 (per the firm's advertising) → the 1870s (by address) | 7 | Dating runs by the workshop ADDRESS by year (Hawley/Tweedale): Sims Croft — by 1841, School Croft — 1851, Gell Street — c. 1860, Monmouth Lane — the 1 |
| 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 Reynolds the mark ENGLAND is |
| 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 |