Sho sounds like a 1½. .32 rimfire tip up barrel. To pin it down would have to know exact markings, barrel length, barrel round or octagonal.
From ser # looks like a second issue 1½ tip up. If barrel 2 3/4 or less, books at 550. If barrel 3½ books at 300......both numbers for ninety percenters.
Sounds like you did OK on price at worst and great otherwise.
Sam
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