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Whatever you have, please remember that Gibson has never been all that great at sticking to their own specs. Nearly anything is possible.

A-1s changed a lot over the years, but aside from the top finish, which I wouldn't make a big deal about, what you have seems to be an A-1 from 1922:

Model: A-1 Mandolin
Available: 1902 to 1943
...

I think it is an A model not an A1 which would have have a logo inlay and a double rosette. As you mentioned the bridge is non original and the pickguard is missing. With a non original case I...