Hi, looks like a good cornet! My 73 Ambassador is of the same vintage as yours, I was surprised at the condition of the lacquer do to most Old's lacquer problems that I have seen.
Great playing horn. Mine''s lacquer and body condition is similar to yours with the same case. I lucked out and found mine locally on Craigslist for $50. I have used a Bach 5C(came with horn), 10 1/2 c and currently the OE Roth MP from my Roth cornet. Enjoy! As you probably know, the type of cornet MP can greatly alter the sound quality and playing characteristics.
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Dave Rafferty
07 Barrington Trumpet,
1972 Reynolds Medalist
55 Besson 8-10 trumpet
55 Roth by Reynolds Cornet
73 Olds Ambassador Cornet
30's Czech small bore Trumpet
Getzen 80 cornet,
33 American Standard cornet
www.kalamazooconcertband.org