The shutter should be a plain ol' Alphax #3, except for the limited diaphragm, nominal speeds 1, 1/2, 1/5, 1/10/, 1/25, 1/50, 1/100, B, T.

I have no idea why the seller is asking so much. The price is ridiculous. Two thoughts spring to mind. Breguet Camera sells, for the most part, high-end equipment to, for the most part, rich and, perhaps, ignorant collectors. The lens in question is in an adapter, apparently non-focusing, to M-42 so may be aimed at rich and ignorant experimenters who want to try out odd lenses on their tiny chip digital cameras. Look at his sales.