Pickwick Watercolors Originals?

These two pen and watercolor pieces were advertised as 1890-1900. They are signed AGK. They are 9 x 12 inches. They seem to be actual watercolors to my very inexpert eye. I found several references to smaller pieces by this artist with the same subject matter - Dickensian characters. These smaller ones were in the 6 to 7 inch range. Do mine just have more space around them and therefore are the same size, just not matted?
Each is claimed to be a watercolor. I am very confused. Where these cranked out by the artist or are these printed outlines filled in with watercolor or are these prints?
They have very simple frames. Would like to learn. Can anyone tell me what is going on here, please.

 

Just as a point of reference ...
https://www.darvillsrareprints.com/...t by Kyd Joseph Clayton Clarke circa 1890.htm

 

Great article. I will have to see if I can tract down the book "Dickens and his illustrators" to see if I can find more information. Thank you very much for tracking this down.

 

I found the book, Dickens and his Illustrators, as a free online book. I couldn't find AGK, though.
The Project Gutenberg eBook of Dickens and His Illustrators, by Frederic G. Kitton.