I think this is a Cambridge etched jam jar. Florence’s Glassware Pattern Identification Guide v. III gives a stem the pattern name Wedgewood and indicates that it is a combination of etches #408 and #625 “Clover” Four Petal Etching.  However………the etch on this jar is NOT “Clover”…so I do not know if it can still be considered to be Cambridge’s Wedgewood.    I think it is safe to say that the main etch, with the wreath, is #408.  If anyone knows more about it, I would appreciate knowing.  Replacements.com reports that etch #408 was in production from 1917-1925.  A mystery……