Arab Arms, it has what I assume is the year, 1882.
There are newspaper snippets, at least as early as 1860, Arab Arms, Watson St, Birkenhead.
Different location in Watson St? Knocked down and rebuilt? Top half added?
It looks like that top half is false and is just a wall. Very strange.
Pic on BFA. Again, login to zoom in. https://www.britainfromabove.org.uk/en/image/EAW029285