Don't know about actual boats but I used to have blue prints for a Mower designed M. I don't remember a date and don't think there is a name on the plan. I could check on that but you might find that data on the Mystic web site with the Mower plans. added: Looking at the Mystic collection the only Mower/M connection is a Rosenfeld image:
WINDWARD, M Class, #14, undersail, 1933
PHOTOGRAPHS - SOFT NEGATIVES
Black-and -white negative
Rosenfeld and Sons
1933
Safety film
That might well be the boat for which I know the blues. A beauty it looks.
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