Family line
Seiko 4R36 / NH36
This profile traverses clone_of · derived_from · design_imitation_of · ebauche_of · incorporates_module · licensed_copy_of · module_on · revision_of · tooling_transfer_of · variant_of and keeps disputed edges. Every edge in this view carries at least one reference.
Generations run left to right, ancestors first, and the axis along the top is ordinal rather than linear: each band is one generation, labelled with the range of sourced introduction years it contains. A band reads “—” when no caliber in it has a year anyone published — the gap is the finding, not a rendering failure. Dotted arcs above and below the drawing are related edges — successor, drop-in, no-derivation — which are stored in a different table from lineage and can never form part of an ancestry path.
Every edge in this view
| Caliber | Relationship | To | Status | Detail | Sources |
|---|---|---|---|---|---|
| Seiko 4R36 / NH36 | derived from lineage | Seiko 6R15 | accepted | — | |
| Seiko 6R15 | derived from lineage | Seiko 7S26 | accepted | — |
Sources
- 1watchuseek.comhttps://www.watchuseek.com/threads/seiko-4r36-vs-7s26-major-improvement-or-just-added-hack-hand-wind.937856/forumtier 4retrieved 2026-08-241 fact on this page
- 2Caliber Cornerhttps://calibercorner.com/seiko-caliber-6r15/curated dbtier 2retrieved 2026-08-241 fact on this pagecited, never crawled