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What is this marking on the cylinder?

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Thank you sir!

Yep, I got really excited last year when I won a supposedly "HRC" cylinder on eBay.

It turned up with all these engravings and marks all over it and I was convinced I had something special.........until I pulled my stock 07 cylinder off and the stock cylinder had all of the same engravings!! It's a production line code of some sort


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