Welcome to the forum Mike!
Like Peter suggested, pics go a long way in assessing early Alembics. 75 is a great year for Alembic, as they stepped up instrument production significantly, every one is still unique as far as wood recipes and body shapes go. Every once in a while one will show up with custom inlays, electronics, or brass, hence blowing everyone's mind all over again, so yeah.... Pics please!!!!!
Also, I'm curious what scale length the MSG is... I have a 75 SSG which is 24.75, and I'm pretty sure the LSG is 25.5....
-Mike