I have a working Seiko 0644-8000 - not the most common watch, whose module is compatible with the more popular 0624-5009.
I have a 0624-5009 and spare module already, so this watch is surplus to requirements.
Question - would you sell as a complete 0644 or as a 0624 replacement module? Given the popularity of the 0624 I suspect it would sell better as the module only, but it seems a bit of a shame since the watch isn't in bad condition (needs a clean and polish of the crystal and case, and realignment of the internal bezel but that's about it).