Pro Vercelli are clearly one of the real powerhouses of Italian football or at least they were in the early part of the 20th century. They won 7 league titles between 1908 and 1922. As far as I can tell this shirt was to commemorate the club's first league title. The club has fallen so far from it's heyday that it dropped to the fourth tier of Italian league football and went bankrupt in 2010, the club name essentially being taken over by another club from Vercelli. The St George's cross on the badge is a common motif in Piedmont and has no link to England.