I want to congratulate and thank the people involved with the ChipGuide on uploading hundreds of Mason order cards during the last couple of weeks. Those cards contain an incredible amount of information. Amazing that these cards, some dating back to the early 1930s have survived.

Just a side note. I notice that the hub chips are coded on the cards as being B-9, B-10, and occasionally B-11. At first, I thought the codes correlated to the more rectangular hubs vs. the more trapezoid hubs, but I can’t figure out a consistent correlation. If anyone knows what specifically the codes refer to, I would be curious to know.