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Serial number “Z” prefix???

1 month 6 days ago - 1 month 5 days ago #231362 by juiceman
I’m looking at a D5 that is for sale on BidCal website (no, I’m not bidding on it). It is a 98J series, but it has a “Z” stamped before 98J. What is that all about? We used to have IG Zumwalt Co. here, is that something they did themselves? Or? 
I have come across this on more than one CAT around Northern California.
Someone please enlighten me. Thx. JM
Last edit: 1 month 5 days ago by juiceman. Reason: Add photo

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