Does the seat-tube have a single boss like a water-bottle boss about where the front mech would go?
Because if so it IS for the front mech, the Simplex A223 (the A222 is the double version). These are the only mechs that fit that boss (as far as I know); fortunately they are not expensive, and good mechs. They were also sold as badge-engineered Gimpiemme and Edco and possibly Sachs or something else.
There are a few of the double versions on that auctions site right now; the only triple has a broken clamp bit. You want the triple, it's easily distinguished, it has a much wider inner cage plate, it extends below the outer by a good half-inch.
EDIT: not *that* triple, a good one.
Oh, and for 60 euro that's a score, no question.
Last edited by oneclick; 04-15-21 at 04:02 AM.