Actually I have 2 pcs of Domed sapphires with OD actually made for fitting in place of 25-295(C)
Here comes some more self-advertising, but check the trades are later. They actually were for (as far as I know) the first Tempus Machina-replica-project ever. That got scrapped after several years due to annoying Vietnamese dial maker that simply couldn't follow instructions...
Here's some info:
Yeah, correct and incorrect. The only reason they used a 800 crown is since the 6538 they we're emulating used a 8mm Brevet-crown.
Their 809H (5512 Explorer) uses the stock 7mm Triplock, even though a 700-crown Twinlock would be more suiting.