Butter Fingers at The Old Dairy, Crouch Hill

Last week I was chatting to Jason at the Oxfam Books & Music shop at Crouch End as I assessed my card stock there. As I added some more of the Old Dairy at Stroud Green he asked if had noticed that one person depicted on the sgraffito panels had something extra.
Intrigued, I walked back down the hill to take another look.

Cards

I have studied these panels many times but although I had noticed that the people aren't what you'd call beautiful and are mostly out of proportion with the other characters and objects around them, I hadn't spotted that one of the butter-making girls has an extra finger.

A ghostsign above The Old Dairy

Here we go again... how come I have only recently been spotting ghostsigns that must have been there for decades?!
Considering I usually stop to admire the Old Dairy building, you think I would have noticed before last month that there is a faded sign above it to the right on Crouch Hill (originally part of Stroud Green Road).

The big name at the top looks to end in ROW and the word AGENTS is evident.
As usual, any ideas and information always welcome