I put my initials in my work. If it is a birth sampler that already has a date on it, I dont bother to put the year since it is already there. But for a HAED, I would definately add my initials and year - in a corner using backstitch that is a few shades darker (or lighter) than the stitches in that area. I havent framed any of my larger pieces yet, but I think when I do, I will add an index card with more detailed info about the piece in the back - full name, name of pattern, date of start and finish, and if it is a gift, then who I made it for.
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I have signed some samplers by making my initials a different color on an alphabet, I should try to sign all my work but often Im so excited to finish I forget.