Benjamin Benjamin Franklin 312 pre serial - Is this the earliest version?

Been looking for one of these, for quite some time. Finally lucked up on one locally.

I know there are a few changes that date them. Curious if this is the earliest version with the non bullseye safety and non adjustable rear sight?

Please school me on pre serial BF 312's. Any advice on fixing her back up, is also greatly appreciated.

What a cool form factor. Dang thing still works too!






 
i have one built in 1959, the year i was born. my dad bought it new and gave it to me when i was 12.
still got it today and its been restored by Dennis Baker (Baker Airguns) several years ago.
it will never go away from my family.
Benny 312.jpg