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According to "Spann's Guide to Gibson", which, in my opinion, is very well researched, your mandolin was made in 1916 (per FON) and sold in 1916 (per serial #).
The other mandolin you looked up was...

It is all too easy to make matters worse by trying to make them better. If your mandolin sounds good then I suggest you play it and let the old crack be. That is an OLD crack with some ancient...

For a proper repair, all old glue must be cleaned out, the fit must be made good by whatever mean necessary, whether that is closing the crack, loosening the brace and closing the crack, adding a...