I don’t know the answer to this but, are there metric cutters offered in the world of checkering? I ask because 17 lpi equates to a pitch of 1.5mm (ie: 1/17 = .0588) (1.5 x .03937 = .059).
Custom cutters aside, I’d imagine that, if metric cutters are/were used in parts of Europe around the turn of the century, they’d certainly have made their way into the toolboxes of individuals tasked with checkering back in the day. And now, today, if metric standards are available, a “17 lpi” cutter may very well be available off the shelf.
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