Vintage Lithograph 18th Century Campbell Metzger Jacobson

ITEM INFO:

I was given this by an elderly woman who had been collecting (and had tons of) antiques for most of her adult life. 

I took the fabric picture out of the frame and found 3 different areas of markings.

1) Says "Parasol girl"

2) Copyright 1803? Or 1808? I cannot make out the year.... It looks more like 1803 the more I look but I don't know...

then goes on to say "by CAMPBELL METZGER AND JACOBSON"

3) I took the best picture I had of this last "marking" on the back. I have no idea what it says, cannot read it.

This item is beautiful, and in what I thought was excellent shape until I saw the back (see pic) and it looks stained from something. The stain does not show on the front at all, I wonder how it even got in there.

Thank you so much, any information is greatly appreciated!