The picture below shows a larger view of this Old BSA Tools Ltd Employee or Advertising Premium Neck Tie Jewelry Bar Clip. The tie bar is not dated, but it is old. It has some type of machinery on it and it is marked on the front of it as follows:
BSA TOOLS LTD. ENGLAND
The advertising necktie bar measures about 1-1/2'' x 3/4'' x 3/4''. It appears to be in excellent condition as pictured.