I picked this one up Memorial Day weekend at an antique store. It is a new in the box 194OT with the shield from Asten, a company that made felts for the paper industry. According to what I found for online history, this company started about 1890 in Belgium and then later started a manufacturing plant in Philadelphia about 1931.
When you Google Asten mostly what you find are knives, primarily Schrade, that have the Asten name on the shield. Apparently like a lot of other companies that produced felts for the paper industry, they also gave away a lot of knives!
One of the unique things about the Delrin on this knife is that it is much darker in color than the Delrin on most Old Timers.
Pardon the lousy indoor pictures, the shield is really quite shiny and it makes it difficult to photograph.