Hemingray glass blocks come in a different sizes and patterns To date there are no know glass blocks to be embossed Hemingray. For information on how to ID a Hemingray made glass block see the ID & research section of the site.
The ice green blocks are the oldest. They were made during the time when O-I bought Hemingray. The ice green ones don't have the O-I logo on them. The smokey colored one pictured below was probably made out of the same glass at the TV Tubes that were made during the last years of the Muncie plant.
A photo of some Hemingray Glass Blocks in use in a building on the grounds of the muncie Hemingray Factory.