All About Pocket Knives

I was walking thru a antique shop the other day and I think I saw a schrade double x tested, single blade, lock back.The blade was etched with some writing. It said Schrade XX tested Wofferton or something like that. It was in a box, and the knife had ivory or ivory color handles. We where in a hurry and I did not look to closely. Does anybody know anything about this. There where a lot of knives in the showcase, so maybe I got the nome confused.After we got home I thought I should have looked closer.

Rocko, it was likely a Schrade IXL Wostenholm knife. They did several models in bone with scrimshaw nautical scenes. Here are a couple of examples:

that was it, thank you, I just went back to see.