Browning Safari
A nice piece you have there, granpa's gun to boot. The serial # would give it some collectors value, even if it shows some use. The 375 is used worldwide, although some consider it "light" for some African game. If the corner store in Africa has CF rifle ammo it will be 375 H&H. Check Browning's web site for dating by serial #, factory letter was only $25 last time I checked.
Family treasure.
The battle, sir, is not to the strong alone; it is to the vigilant, the active, the brave...
--Patrick Henry