Encapsulating a damaged Sweet Caporal PX7 disc
 

I recently picked up what’s left of a 1909 Sweet Caporal Domino PX7 disc of HOF Bobby Wallace. The metal ring is missing and there's some paper loss on the edge.

I had hoped to have SGC slab it as Authentic but they said no. I asked CGC and they also said no.

I know that PSA grades these and as much as I despise PSA, I suppose that if I want it encapsulated, I will have to sub it to them. Does anyone have any experience subbing a damaged PX7 disk like this to PSA?