Stamp is well tied by a very fine strike of this postmark. Then over-cancelled by normal RED MALTESE CROSS.
This NORTH YORKS pre-stamp postmark not seen by us as a "TOWN CANCELLATION" before. Penny Black is slightly cut-into at SE corner.
Piece has horizontal wrinkle/bend as can be seen on rear scan. Nevertheless possibly a UNIQUE combination of cancellations.
Overall Good for an item of this type and period. Please look at all the scans to help form your own opinion. The item "GB PENNY BLACK (AA) BRIGHT BLUE Undated WHITWELL Cancel 1840 Piece RARE YBLUE5" is in sale since Saturday, August 29, 2020. This item is in the category "Stamps\Great Britain\Victoria\Penny Blacks".
The seller is "samwells-covers" and is located in GB. This item can be shipped worldwide.