Firstly it will have a serial number on it probably in two places, on the rear tube and inside the front on the right hand side, last two numbers will be year of manufacture.
Re value, if it's that good it will carry a premium but not by much, they do pop up from time to time in top notch condition, but they don't sell for silly money.
I'd use and enjoy it if I was you. I bought a lovely little Redstart last week for the same purpose, it's in nice condition and I paid £90 GBP for it.
I also have an ok Redstart, and a near perfect Rover 310.
I don't know why, but I love them.
__________________
|