Anybody here anymore?

I inherited a 99 from my grandfather. Shot a deer with it that first year, cleaned it and put it in my safe. My 13 year old son is just coming into the hunting scene and he is infatuated with this rifle. Can you please let me know what year is what manufactured and steer me to any information explaning the 99E or 99F, so He and I can learn about grampa's gun together?

The serial number is 4299XX.

Thank you!