This is a liquor cocktail glass with an etch called First Love.  The maker was Duncan & Miller from Pennsylvania.  The etch was in production from 1935-1955.  I have stared at this a bazillion times and have tried to figure out what the pattern has to do with one’s first sweetheart.  The stem is interesting, but actually too ornate for my liking.  I don’t think I have any other Duncan & Miller stems.  Don’t know why.  Check out The National Duncan Glass Society at www.duncanmiller.net if this stem appeals to you.