1868 Brown and Berry six-sided carpenter's square.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...e_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...nter_gauge.jpg
Previously:
https://www.homemadetools.net/forum/...342#post173202
https://www.homemadetools.net/forum/...952#post156773
https://www.homemadetools.net/forum/...9580#post89618
https://www.homemadetools.net/forum/...900#post167789
https://www.homemadetools.net/forum/...890#post160096
