I have the 4-MMMM chip in yellow.
I have sent it to HH for ID twice. I am afraid it will never have an ID.
Mason records are only good for hotstamps. Hub inlays were put on at the manfacturer and Mason did not scan the inlay chips to the file card.
Would need to have the name of the guy or joint that ordered it. to get an ID. If we had that, I guess we would not need the card. Catch 22.