17th century paper ruling board for making discreet lines on paper or parchment.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...d_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...ling_board.jpg
Previously:
https://www.homemadetools.net/forum/...636#post159259
https://www.homemadetools.net/forum/...805#post156136
