One appeared to be an after market, with aluminum contacts and little wear, the other an original with brass inserts and looked unused.
The after market one cracked during cleaning and went to landfill, the brass one cleaned up as good as new, straight to the spares cupboard. There was also an after market rotor button good enough for a spare.
For $10 US a good deal, very happy.
The one on the right is the after market aluminum unit
Before it cracked the aluminum cap did not look too bad
The brass cap prior to cleaning
Brass cap looking good
Outside like new