2 antique JG Keulemans ornithology bird colored lithographs

Description

These framed prints come out of a local estate.  I don't know their age though from the framing and matting I can tell that they are fairly old.
The birds were originally done by J.G. Keulemans and his initials are worked into the image at the lower left side.  One is a Syrian Nuthatch and the other is Kruper's Nuthatch.
The entire piece is 14.25 by 17 inches.  I don't know the size of the print itself.
These prints come from a local estate and are just as found.  I have not opened the frames.
The prints themselves look good and remain quite bright.  They have been under the mats for a long time and I can see that there is browning along the edges. The mats, which have hand painted details, are also in pretty good condition....with some browning.  The frames are solid and appropriate though they have lost some of their paint over time.
The backing is rough.