I don't have my catalogs handy but it reminds me of possibly an Edwin brand mandolin sold (possibly made) by the Tonk Brothers. In any case, it doesn't look to be in very good shape -- from the pics it seems like the top has some warpage/sinkage. This looks like a low end mandolin and repair might be more than it is worth.
Looks like the top might have sunk on one side where the second brace is located. Probably worth having it looked at. Be sure to put ultra light strings on it.
Probably not ivory trim, at least hopefully. $50-60 worth of tailpiece, though, if it is shot.
Ever tried, ever failed, no matter. Try again, fail again, fail better.--Samuel Beckett