I dont know which stamps might correlate with which year/s or exacty how their system might work, short of the very obvious, as like i said i didnt bother asking. The fact the place is more like a "back door" to the factory than your typical stand alone retail store im more inclined to take what the guy said as being correct. He was quite emphatic when i asked. And would make sense in my case, if my Legend was made by Stuart but has the M stamp. Anyway, ill dig a little deeper next time im there.