He's so cute!
Congrats on your hammy
If you got him from the petshop it's a hybrid. To me he looks more like a Campells than a WW (judging from the face, I find that WW often have a bit "rounder" or softer look, while CB look a bit "pointyer"
), but he's probably a mix of both
His looks a bit like my new campbells, her coloring is Opal and looks like that