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Peterson Hallmarking Chart.

Some question have come up on the year dating of pipes, here's the Peterson Hallmarking chart showing which letter type for each year.![hallmarking-new[1] hallmarking-new[1]](https://thispipelife.com/us/tpl/forum/uploads/imageupload/143/6VUPPTIZCOA4.jpg)
![hallmarking-new[1] hallmarking-new[1]](https://thispipelife.com/us/tpl/forum/uploads/imageupload/143/6VUPPTIZCOA4.jpg)
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