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Looks like yours is Type IV with respect to the initials. AC is joined but M is not connected. This is noted as a fairly common variety.
Yes, I was not aware of the signature variations until I looked it up in the catalog after buying. The most common is ACM all connected. I looked through Siegel's power search and didn't see any AC connected like this. So, that's interesting. Quite happy to add it to my collection. I have an unused proof from the "sheet of 9" (9X1P5b) also bought cheap because the seller didn't know what it was (I got it certed). I'll have to mark this as my bargain page.