Featured John Cother Webb Signed Colored engraving

This was an antique store find so i might have paid too much?
8" x 10 1/2" Colored engraving After Van Dyck.
The boy is Prince Charles Stuart, later became King Charles II.

 

I'd guess it's a mezzotint. Looks nicely colored.

Here's a pair that had an estimate of 100£-150£ (2009)
https://www.invaluable.com/auction-lot/john-cother-webb-1855-1927-two-coloured-53-c-f2e1ecaf94

Don't know what they sold for (or if).

And an article about Webb:
http://victorian-era.org/john-cother-webb.html

 

Maybe $55.00 wasn't too much??

 

Looking at asking prices online for other Webb mezzos, it doesn't seem unreasonable.

 

@moreotherstuff
I think this is the original painting?
Mikey

 

Looks like it. Webb apparently did each of those children as individual portraits. The smallest, James II, has shown up on these boards more than once in prints.

 

Sold it for twice what I paid. Very happy!!
Mikey