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Here is a photo of another frame with no visible marriage marks, or at least I didn't think so. I was reviewing some photos I shot today and noticed the faint red marks on the brace and cross beam. The marks show up via the camera, with the eye they aren't as visible, most likely the lighting is poor. The red is just under the electrical wire it looks like a 17, the white marking is from the swallows. Red on the tie is harder to see.

When did red grease pencils show up in layout? I think Will T. mentioned lead pencils were around just before the Revolution. Tim