STAR did have 7,63m/m version. If we consider Mauser created C96 targeting on winning a major western power's military contract, then, Spanish gunmakers created their 7,63m/m pistols on target of gaining Oriental market in 1920s. STAR was one of them but they missed the point. According to
Gun Report, STAR's 7,63 was initially driven by that.
Simpson has another STAR with extended barrel listed
(Link: STAR with extended barrel). I saw that gun a few years back selling for the same price at the same site. It was sold. Current one is probably the same one, back to market again, and asking the same price.
First time seeing a STAR with stock though.