Here is an early oil pressure relief valve for a vintage/classic AJS mocel 20 or Matchless G9 500cc twin. This has been in my parts box for nearly 60 years - came off a 1951 model.
Missing ball and spring.
Threads are in good condition.
Head of the access screw is damaged, but this could be cleaned up in a lathe.
Hate to throw stuff away - where would you get one now?
Please do your research and be sure what you are bidding on.
I have tried to show the items condition in the pictures - please view all of the images.