Actually, I think it is the first watermark, making it Scott 8, ACSC 17. The A is just too wide to be anything else.
I looked through my duplicates, and have the following examples to show the extra watermark line. I could only find on the bottom and left (when viewed from the back). And these are the third watermark, Scott 48 (ACSC 19). If the OP wants one of them, please send me an email through the system.

