O.k. in my second book I found the name. It is called Honeycomb (Bubble Optic). They only mention it being made in Blue optix, and Green overlay. But it is for sure what you have. These was made in 1951 - 1953, that is the Blue and Green ones. As mentioned by wendy, if if has this mark it was made post 1972, this is when this mark was being used. This was probably made with the Honeycomb mold post 1980's, However the one in the picture does not have the "Flaw". I still have two more books to look through maybe it will give me a bit more.