How to Identify collectible glassware from the 1940 s to the 1970 s

Bottle, decanter, genie, hobnail, jadeite, rare, vintage. Empoli Decanter Blenko/Wayne Husted Style Withstopper 11 Vintage MCM READ. This item is in the category Pottery & Glass\Glass\Glassware\40s, 50s, 60s\Other 40s, 50s, 60s Glassware.