‘Seven Devils on Horseback’ ? 
Doesn’t help me ! … this must be quite obscure, plus some of the hats a costumes don’t look typical SW … a real puzzler 
That’s a young looking Gino Marturano, maybe an early western. Hmmm…Duello nella Sila?
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The Last Rebel (1971), a.k.a. His Name Is Somebody.
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That’s the one JC.
La vittima designata ?
No Aldo, not that one.
Is it Giallo in Venice? I had guessed this on Mickey’s turn, but the background of the first still is clearly Venice.
Not that one, makesthemovie (it’s not from the late 70s).
Appearances in SWs for both actors. 
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That’s right, Aldo!
Thanks JC
Try this one, guys.
Looks like a clue is required - This stars 3 of the biggest names in SW history