So Would Try To Cross This 1914 Cracker Jack Mathewson To A PSA 1.5?

So would you try to cross this 1914 Cracker Jack Christy Mathewson to a PSA 1.5? Or simply crack out it and send it in raw? Or better yet, leave it as it is.
1914 Cracker Jack Christy Mathewson SGC 20 / 1.5 Fair
/s/ JackWESQ
1914 Cracker Jack Christy Mathewson SGC 20 / 1.5 Fair
/s/ JackWESQ

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Always looking for Topps Salesman Samples, pre '51 unopened packs, E90-2, E91a, N690 Kalamazoo Bats, and T204 Square Frame Ramly's
I would guess $5,000 to $8,000 for a PSA 1----$14,000 to 18,500 for a PSA 2. On this card the 1/2 bump might work in your favor.
I'd leave it.