19th C. Austrian Plaque Marks. Maybe Hermann Ratzersdorfer?

Hello all,

I’m new to this site and collecting silver. What I have here is a antique Austrian silver plaque signed and stamped with maker’s mark I believe. At the lower lefthand corner it is signed: G. F. At the lower righthand corner, it is stamped with a monogram that I can’t make out. I took a couple of pictures of it, and also drawn a picture of what it looks like on paper. The item is very dirty. If anyone can help me ID. these marks, I will really appreciate it. Thank you!

P.S.

I cleaned the silver plaque today, and attched a photo of it. Got a lot of dirt off, but not all. The plaque is of the SALZBURG FORTRESS HOHENSALZBURG in Austria. It is very old! I’ve looked at a number of images, and the monogram that matches the closest is that of: HERMANN RATZERSDORFER. Again, there is a mark of: G. F. in the lower left-hand corner, and a monogram mark at the lower right-hand corner. Can anyone help?
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