Sand cast fittings have been used and have a thicker/cruder look (usually) compared to IC/lost wax ones. Of course this is dependent on the maker's willingness to take the time to file/finish the "rough" castings. But in general sand cast weigh more and are made at a slower rate and/or with more workers to begin with. I think I have a sand cast fork crown in my stash.

This ID question might be of interest to the C&V sub forum members. classic-rendezvous-lightweight-vinta...oglegroups.com is another on line group of older lightweight bike collectors that might be able to help. On this forum Doug Fattic might be the most knowledgeable. Andy