Savage 99E
I don't know if this will help or not. According to the Standard Catalog of
Firearms, the Model 99E (E for economy) was produced from 1960-84. However, the SN you show does not match with those dates. Regardless, early Savage factory information indicates there should not be a big difference in takedown procedures. With that in mind you may want to see the NRA Guide to Rifles and Shotguns. Instructions there may help you.