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I have seen the serial number on the back of the G# and also some side keys. Also being that it is a very early model, make SURE it is not a High Pitch model (HP). Many of the time were and some were not marked. If it is HP, it is nearly worthless as it cannot be played with other instruments but I guess you would have figured that out playing it. Those early horns are OK but the later ones are much better. Look for a New Wonder from the 1920s. A straight one can be found in the $800-1,500 range and curved slightly higher.