More pics would help. Assuming it’s a men’s bike due to gear changer pulley at top of seat tube. I would say early 70’s due to reflector pedals, braze on for chainguard Mount and plastic covering for SA shifter. Has front dynamo for headlight, which is worth some money. Brooks saddle has been left in weather and brightwork has more rust than you would think in spite of good shape of paint. If it has “Open Hand”” chainring that’s a plus. Evan at that and assuming it’s a men’s bike in what seems to be in OK shape I’d put a value at $125-175