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@Scilly.Suffolk
1975 could be right, I doubt it's younger.
Braze-on shifter mounts and under chainstay derailleur stop are later features. Does the derailleur cable guide go under the BB? Again a later feature.
Band-on front derailleur and the lack of top tube cable guides are earlier features (or are they on the NDS).
"Earlier" and "later" aren't definite dates as different builders introduced/phased-out these features at different times, but mid-70s to the mid-80s is, broadly speaking, the transition period.