Well now, that is interesting. The first year of 110 rifle production was 1958. But the 243 Win wasn’t released until 1959. I’m guessing the other one was chambered for 308 Winchester? Do you happen to know which serial number was the 243 Win? Honestly, I’m wondering, although release year for the 110 was 1958, I’m wondering if those were Serial Number 0001+. (Which likely none of these still survive.) Then rifles with SN# 1000+ started in 1959. Maybe? Afterall, the 110 was first chambered in 243 & 308 Wing.
Interesting information to contemplate & discuss. I’m not even a collector. My only interest is my love for the Savage 110 rifle.