Engine number identification.

Hi all, i have a Li 125 engine casing, number 125Li 563027 and im trying to find out what year scooter it was from. If i go by 'frame' numbers it says 1959 but it has the chamfer around the drive bearing which i thought was later on. Also i have a casing stamped 150 Li 767498, and again using 'frame' numbers its way out of scope as this casing doesnt have the chamfer on the drive bearing which made me think series 1 early 2 
