These may look modern at first glance but actually they are over 100 years old and were literally some of the first ball and socket suspensions ever produced... they are uncommon in mahogany but in gray they are quite rare . In total I found 11 at this site most of which were mint... befor this find I only ever found two of them in 20 years of collecting these were an Ohio Brass product the Idaho Line I found these on was abandoned in the 1930's