This item is:

Sheet of 100
Cinderella stamps
issued by the

'Warren Bowman Gum, Inc'

Titled:
Sales Carnival
Prize Stamp

Philadelphia, Pa.

Sheet size:  5 1/2 inches by 7 inches

Date of Issue:  Unknown, but assume it was between 1948  and 1956.  When the name "Warren Bowman Gum, Inc. was in use.


EFO:  Misperf'd throughout the sheet and with overinking (mostly on the right and left side stamps).  Other EFO's on sheet may exist.

Note:  This sheet of 100 stamps is quite unusual, because the "Warren Bowman Gum, Inc." sold sport cards with its gum.  NOT STAMPS. 
As note on the stamps "Sales Carnival - Prize Stamp", apparently these stamps were used by sales personnel in the process of producing SALES (Sales Carnival) for "Warren Bowman Gum, Inc.
I have done internet searches and nothing about this sheet of stamp has come up.  Therefore I believe this stamp to be extremely rare.  
I believe this is the only sheet of 100 stamps like this. 
Probably a one of a kind.


Historical Note:  Warren Bowman Gum, Inc. 

History of Bowman Baseball Cards: – The history of the Bowman trading card brand dates back to the founding of Gum Inc. by Jacob Warren Bowman in 1927. From humble beginnings in its Philadelphia headquarters, in just 2 short years, the company’s Bloney brand became the #1 selling gum in the country. By 1937 the company owned 60% of the market share in the United States.

The 1930’s saw a crowded marketplace for baseball cards as a result, Bowman’s first trading card releases were focused on non-sport topics including the hugely successful and still popular “Horrors of War”.

In 1948 and the renamed Bowman Gum Company emerges as the market leader in the production of baseball cards starting with the ever popular 1948 Bowman Baseball card set. This was followed with the release of additional baseball card sets between 1949 and 1955.

However, by this point in time there was a major new player on the block in the form of The Topps Gum Company. Between 1951 and 1955 a proverbial state of war existed between the two companies that would later inspire the book “The Bubble Gum Card War”. Topps won that war in 1956 when they acquired Bowman for $200,000 (the equivalent of over $1.75M in today’s market). This would mark, what would appear to be the end of Bowman.(Internet search)