FDR 6 cent stamp Horizontal Coil Roll

I bought a large lot of items from a client that is moving. Inside one of a box of office supply was a roll of 6cent stamps. My first thought was why would anyone have a whole roll of stamps still. After all these years. This came out in 1968. Then I notice the misperf and realized that's why it was kept. The rubber band has long since disintegrated but is still attached to several stamps. I unrolled about 30 stamps out and they are all the same.