The slide has 88h engraved into it, as well as the serial number GC3xxxxx (x's are digits). The newer ones have different art or often say 'artist symphony'.
I did not see this style of bell engraving anywhere I looked. The Bell is engraved similarly to the Elkhart model, but instead of 'Elkhart IND USA' it says, 'made in USA', leading me to believe it's a post-Elkhart horn. I cannot for the life of me figure out when it was made. I recently came into possession (cough cough, impulsively bought cough) of a Conn 88H.
