Its not like the few 3/4"-7/8" range shooter size Vitro Anacortes Classics were much earlier. There are only a few of them and it just isn't documented what year exactly between 1988 and 1992 they were made (as far as I know). They do not resemble the 5/8" Anacortes Classics anyway. Sure the marble could be an earlier Vitro, just not an earlier Anacortes Vitro.