The absolute Best I could bring up, considering there is NEXT to NOTHING to work with, IS circled in red.....the best I can say is there IS some lettering there.....just what it is I cannot say.....SORRY.... Above image is after running it through the enhancer.....below is PRE running it through enhancer.....just Photoshop....
The section I am talking about is just above the top of your red line. Your line actually goes through the M and the il touches the top line. That's ok, like I said it is probably just me. Thanks for trying.
I looked, but actually "I" didn't see anything up there.....sorry....and I inverted the image before starting.....that's when, if there's something there, it will frequently show up.........sorry......but this is what it looked like, and the area you saw, as well as what I saw...
Wow, sorry for my late response i didnt have acces to the painting yesterday. You ve all seen more in a few days than i did in a year since its hanging on the wall. I ve looked at it and it may indeed be letters that were there but i m not 100% sure, first i thought i saw something somewhere at the right tip of the sitting swallow s tail but i lost it. but there is defo something in the lower right corner, i l amazed that you people saw this wow. attached slightly better pictures but i dont have a nikon or something better here sadly, I m so happy to have found you people here online,
Ah damn just saw your reply, @Aquitaine thanks btw! i think the best i can do is sent a few better photographs to a museum in czech republic in the hope they reply but they prob wont care unless she is important enough to do the effort, ☹️ thank you all!
not to be a downer but it could be that someone painted a copy as you said and liked the result so much they decided to frame it?