Smokey Bear Poster Stamps SBr. 17-18

This is a block of four and singles of SBr.  17-18.  These stamps were issued in 1956 by the U. S. Forestry Service and were the first Smokey issue to include two different stamps on a sheet.  

These are mint, full gum, never hinged stamps.  Please take a look at the album for collecting Smokey Bear Stamps in my Company Store.  Thanks!!!