Nice bit of deduction and correlation to known offerings. I would suspect you are spot on the money. Comparing the features of the W&S along with the engraving styles offered in Stoeger's catalog would/will probably be the only confirmation you will get. Regardless, a beautiful rifle that was on my watch list as I am sure it was on many others. Congrats.
Thaine

It ain't ignorance that does the most damage, it's knowing so derned much that ain't so! J. Billings