I would date that at around the early 1800’s, with takes it into the regency period of clocks. It is an 8 day English Fusee Bracket clock. The pattern on the back plate is what you would expect with a clock of that date. The early ones the back plate would have been completely engraved as to would the fixing brackets and pendulum bob. Painted enamel dial with convex glass. I expect it has rack striking striking which is on a bell.
Do I see a cut out at the base of the clock for the pendulum? If so then this is a marriage.
I do like how the pattern on the back plate has been continued on the brackets to hold it in the clock. I've not seen that before.
I do like the hands although it looks like the minute hand has been twisted slightly, but I would think long and hard before trying to straighten it.
https://speedtimerkollektion.com/ is a good source of parts for Seiko you will just have to keep looking, both the watches you need backs for are very collectable now and demand high prices so I doubt any one would sell any case parts for them cheap.
Good day to all! Would anyone know where I could source case backs, specifically Seiko (6138-0040 and 6139-7100), beside eBay? The few I can find are priced astronomically and the shipping is more than the part!