All About Pocket Knives

Can anyone help me with any additional info on this Queen letter opener? What Queen pattern is it based on? My son handed it to me last evening when we stopped by his home for supper. "Early birthday present", he said, "don't think you have one of these." The tang stamp appears to be the '52-'55 era, the crowned Q on it's side. It is a 3 1/4" bone handled frame with pen blade plus the 5 3/8" letter blade. The pin holding the bone to the frame next to the folding blade on the pile side is completely gone.
Treefarmer

Can't help ya, but it's a cool item.

It's based on the Queen #3 Sleeveboard Pen pattern. Nice Rogers bone.