Goodyear 1954 Printers Watermark Metal Die Block

Description

GOODYEAR 1954 Printers Watermark Metal Die Block
Measures about 4 3/4" in Length and 1 3/8" Wide.  When laying down it is about 1/2" Tall not including the raised lettering.
Die weighs in at just over 1 Lb and is made of metal.  A magnet does stick to it.
The inside of the lettering and shoe is recessed, not solid.
Die is marked on one side " PGH STAMP CO " and is Dated 6/54
I was told that this die was used by the Hammermill Paper Company in their process of putting watermarks on a company's letterhead or stationery paper.  I was told the process involved pouring a sort of liquid rubber onto the die and when cooled it was peeled off and used to make watermarks during the printing process?
In vintage shop
USED
condition from 1954.  Die shows some wear in the form of scratches, dings, tool marks and some patina to the metal.  Overall still presents itself well for a shop used piece.  Please review all photos and judge for yourself.  Use
ZOOM
feature for close ups.  If you should have any questions feel free to ask prior to purchasing, thanks.