yes the Laurin mark is a early mark signifying very good quality and finish.. You'll see nice thin bands and well polished inner bands.... Problem is there are a few counterfeit Laurin stamps out there,,I have seen them..

So when you see the mark that too must be nice and clear, readable etc even if worn...

These 'Pirate Skull' rings are a good known pattern and very popular with collectors. Take your time and be careful when buying!