I'd be very surprised if you'd find any parts.
Is the jackpot there? It's more important than the skill stops.
It's a shame about the vendor.
These machines were rarely seen in the flesh, I think The Berlin Wall coming down released the ones currently floating around. I know the three I owned had escaped from the cellar in an old building there.
If the vendor roll is there, but the reset mechanism and/or holders for the mint rolls are missing, I'd probably manufacture those and put the vendor into commission.
If the original metal reels aren't present I'd make up some paper ones.
The castings I'd have dipped and polished
The handle and hub the same, perhaps plated if good enough.
Strip the oak sides and varnish, they should have a thin gold stripe an inch or so in from the edge in an Art Deco style, straight lines and angles no curves.
A nut & bolt strip down on the mech, get the rust off, wire brush the base plate.
Paint the castings as per the pictures, remantle it ...job's a good un.
I did mine over a couple of months or so, but the platers were quick and local and it was a hot Summer, ideal for sitting in the garden with small paint brushes.