There is no way to know for sure just by looking. It has the look of a Bell albino, but some Trempers are also dark like that. The only way to know for sure would be to pick the most likely strain and breed it to a gecko that is definitely of that strain. If you get albino geckos, you know the strain and if you get no albino geckos you can eliminate one strain. The problem is that if you're wrong you now have geckos that are double het for 2 different albino strains and this is not great for the hobby --to have geckos where there will be no way to predict what albino strain they will produce.
In any event, it's a nice looking gecko.
Over years of careful selective breeding, over 100 distinct leopard gecko morphs have been created. Here are some of our favorites, along with detailed
oddlycutepets.com
both sites have pictures and interesting information on each morph.