1869 Pictorial . Glue.trap?

Heres a shot of my 1869 U.S Pictorials
I won the Scotts U.S 122, 90cent Carmine & Black
from an online bid, got it for a really good price.
When it showed up , upon closer inspection I could
see it was cut to imperf then glued onto a perforated back piece ?
Yet the grill is still visible from the backside, I tried soaking it off ,
Only the smallest bit of a corner came up, not enuff to set free without damage.
Has any one seen anything like this before ?
Glue.Trapped

It's been rebacked. Someone took a damaged stamp and added the margins and the perforations. You should return it and get your money back if you can.

Revcollector,
In your opinion what would something like this be worth ?
I paid about $260 American a few years ago,
(thought it was a good price)
too late to return.

I wouldn't pay you $20 for it.