I have three Leo era Music Man basses:
- '78 StingRay
- '79 Sabre
- '80 Sabre
All three have the model name on the headstock. Here's the StingRay....
Question is....why does the one you are thinking of buying NOT have it?
If you have contact with the seller, ask him to disassemble the neck from the body and send you photos of the date stamps. I am guessing they were not born together. The neck is probably a replacement. Could be that it is a Sabre neck on a StingRay body
Whether that is a bad thing or meh is all up to you.