Thanks for trying. I'll try to show the gun to Walt Snyder the next time I see him. The mark looks very original and the gun is very high condition. Walt, are any Model 37T guns included in the factory records in your possession. If so, maybe we can see whether this gun is a two barrel set with one barrel missing. However, my 1954 20 gauge 37S two barrel set does not have a marking indicating the two barrel feature. Bill Murphy