Not really. I used to collect them and the T-38's really had a lot of variation. Many times the 38 was untouched and the mum stamped over with an experimental mark added. A lot were done the same way allegedly because they were unsafe to be shipped out and marked for training purposes only. There are "Stamp overs" that nobody knows what they were intended for. There are hundreds of thousands of T-99's with no model number at all. I have owned 1 "Peicer" with no serial number and have seen many others.
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