Found an advert in the Wrexham and Denbighshire Advertiser, Sat March 16 1861
Plas Issa Building Bricks
Jacob Davies respectfully annouces his being Agent for the sale of these Bricks in Rhos and it's neighbourhood.
Rhos March 14 1861
This seems to be a regular advert for a while!
BUT also this in the same paper, Saturday 8 February 1868
Public Notice
I hereby give notice that I, Jacob Davies, Plas yn Clawd, near Ruabon, will not be answerable for any debt or debts contracted by my wife, Mary Davies, after this date.
Signed, Jacob Davies
Feb 7th 1868
Explains the 1871 - they obviously split up
He also appears as an auctioneer in 1870, selling land near Ponkey !