It looks like a wmk from the photo. The wavy lines are normally: \ = VM waveforms from upper left to lower right corner / = VM waveforms from upper right to lower left corner On your stamp they are running horizontally ... https://goscf.com/t/32218
Petert4522, I actually did not purposely post the subject matter twice. It was accidently done and once I noticed I couldn't find the option to delete the first post. Thank you all for your posts and I will position the stamp at different angles for a more detailed image.
I also don't see any hint of a watermark. If I recall correctly, it was pretty easy to see the watermarks on these stamps without the need for fluid, but it's been a while since I looked at them.
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