I have a Mordecai Brown Sweet Cap. Portrait with this exact stamp. I would post a scan, but I sent it in with a group of cards to get graded earlier this week and can not find where I have a scan of the back. It is a very interesting stamp, and I assumed it was an owners stamp, but when I saw this on Jimmy's - Tinker card I questioned him to see if he could shed some light on this stamp. Hopefully someone on this sight has seen it before and can shed some light on this most interesting stamp.
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