I gotta say that the PB-ST is a private order that should not be listed.

There were two different orders for the above chip made through the Albert Pick co. out of Chicago in 1927.

One order has an M.R.F. and an interlocking PC on the reverse. The other order has ADL on the reverse.

As I said, Dale produced a great reference, but there are errors. Such errors should be corrected.