Yes, 1 year later and we're still sorting things out.... And once again I struggle with finding watermarks. I decided to kind of (strong emphasis on kind of) clean up my stamp desk and get some of the duplicates listed up on
ebay when I found a vario page full of NTBI's (need to be identified) and in comes the watermark to mess with me.
I have placed these 3 in lighter fluid and onto the back of the display card that I use for this sort of thing and see no watermark.
First, this odd looking one. The only reason I'm not satisfied in not finding the watermark is due to the difference in value between watermark VS no watermark so I'm convinced this has one, but I can't find it.

Dipped and scanned and my eyes still can't see one

The other 2
This one I probably won't go through much more effort due to the crease.

Or this one due to the centering.

These 2 were easier to identify.

