US 5c 10X1 Postmaster Issue

 Printed in sheets of 12 stamps. Upper right corner has the value "TEN"  The 5c is with and without a dot behind "CENTS", the 10c has no dot behind "CENTS". Usually cancelled with a penmark in the shape of a 'V' 

Full Sheet

Forgeries

Lithographed forgery

Forgery from unknownm source

Peter Winter forgeries on cover with fake cancels. Note both are identical which is not the case with the original sheet.

Sperati Forgery

1. the fleuron at top right extends beyond the frame line (above the "C" of "OFFICE")

2. the forgery is photo-lithography rather than engraved like the original

Reprint with notation on back