Wondering about an early AM with no hookah port W. Pico WITH serialized label. I was reading on the VDH history of the AM and it showed that the 58's had no hookah and no serial and from what I understand the hookah was added before the serial number. So, seems like it would be unusual to find a no- hookah version with a serialized label. Possibly a transitional model?
There is no telling, USD was bad for using up parts before moving on. It is also quite possible you have a Frankenstein reg....one made up of assorted parts. Open it up and make sure you don't have a DA or Navy body before deciding what to do with it.