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=

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