As I remember, the Spanish sequences are lifted from another film, possibly ‘Vengeance’, also with Richard Harrison.
Aha thanks, if that is the case the IMDb site could make a note of it to clarify. Those scenes I think lasted several minutes.
It’s a while since I watched the movie, but the title sequence uses a clip of a rider going through the famous Pechina area, used in ‘Vengeance’ aka *‘Joko invoca dio… e muori’ … Harrison wears the same leather shirt, or similar style in both films.
I don’t know about the other scenes you mentioned in Northern Madrid. It’s was a common practice to borrow footage from other films with Spanish locations, rather than just the bland Italian ‘Sand pits’ seen in so many low budget flicks.
The stock footage is taken from Vengeance and Chapaqua’s Gold. It’s pretty funny the way you can see Harrison’s facial hair change. I still really like this one. Can’t fault it on the entertainment level.