This is a well known mystery … some say he’s an English ex-pat living in the south of Spain, but there’s no confirmed identification - Also appears as the bartender who warns LVC about Klaus Kinski in ‘For a few dollars more’. plus a couple of other bit parts in Spags of the mid 1960s period.
PS: I started a thread about another familiar face who has some key roles in major SWs of this time, but is never credited … and ‘your guy’ also gets mentioned.