I remember my father having a number of barrow sprayers in the 1970’s thrown in the hedge as no longer used on our hop farm in Kent. Most were made by Drake and Fletcher or Weeks of Maidstone but the iron frame was different to yours. Where are you based as it could be of local manufacture.
Hi, I’m in North Yorkshire, but got it from Retford, Nottinghamshire in 1999.
There are no identifying marks I can find, and as you pump the handle, it also operates a wooden paddle up and down to keep the spray mixed.
I too have an unknown barrow sprayer. I’ve never seen anything like it but it has a paddle as well. They may have been made by local blacksmith for a large estate.