No. There was not.
Within each grade I have found that there can be a good amount of variation in the spacing of the checkering from gun to gun.
Ie: i have seen GH grade guns with as course as 20 lpi and as fine as 24 lpi. Thr same with Ds. Generally speaking I have found that earlier guns have finer checkering vs later guns.
For a B grade I would say that no courser than 24 lpi would be correct.
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B. Dudley
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