Hi all, I have an old book question...a bit esoteric, but this might be the right place to ask it. The book is: "CONSTANTINOPLE ILLUSTRATED" Illustrations by Thomas Allom. Descriptions by the Rev Robert Walsh. Two volumes bound into one book. Published by Peter Jackson Late Fisher Son and Co. No clear date of publishing, however the double page map of "The Mediterranean" appears to be dated 1843.
I have traced other editions produced in two separate volumes, published by by Fisher Son and Co., in 1839.

Can anyone help me with the date of printing for this issue?

Heres hoping Jim