IIRC, some of the prototype originals had Hobbs hour meters in them on the side of the pedestal. The 169 would've been the first production cub to come from the factory with an hour meter as WildBill stated. Some of the earlier cubs had ammeters added, so maybe this one had an hour meter added. Looks like a well done addition, not all cobbled. Nice 107!
By the look of the hour meter, 1437hrs, its been on there awhile!