At the risk of sounding sarcastic it should say so some place on the guitar. The headstock, between the tuners is most likely. But if the name isn't there look in the sound hole for a label. Also look for number inside the guitar where the neck and body meet. L-0, LGO, these will help too. Perhaps its a Kalamazoo, a Gibson second. There are others better versed than I in this arena, I'm sure they will help.

Don