ok wheres the ole timers , what is it ? how does it work ? how old ?

[MAC67]

hi guys i was diggin through some old car parts and came across this , ive got a pretty good idea what it does , im not going to put it on anything , i was wondering , how old is it roughly , value ? and just how they were hooked up , it is a Marvel Mystery Oil oiler for top cylinder , did it hook to the carb and slowly deliver marvel oil to the fuel ? it says to adjust for 1 qt every 1000 miles , it is in really good shape , still has a litle oil in it , jar isnt cracked anywhere and everithing seems to be in great working order , the little spring door works great , and the brass adjust ment is very very free , but not loose , so hit me wiht it guys , whats it all about , did you ever run one ? ive seen similiar setups ran before but not one quite like this .