Selmer mark vii serial number?

[Paulsax]

I wonder if anyone can help me, I've just purchased a mark vii alto as i really enjoy my mark vii tenor, and was wondering what the M stands for before the serial number, as oppossed to the letter N on my tenor and super action 80's serial numbers? Many thanks.....

[Thomas]

Use the SEARCH function-there's been way too much talk on this subject over the years

[Paulsax]

Thanks, but i can't seem to find any threads on this subject, i'm new to this forum thing.

[AhCheung]

That's a good question.
I did a search 'cause I am intested too but couldn't find an answer.
Could someone in the know answer?
does it have to do with the brass gauge? the alloy?