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Really, why so late? I'll attach another pic. Especially the fork crown and the headset seems more pointing to the 50s!?
And not that much braze one's, lack of DT shifter, bottle bosses, and such ... mmmhh.
1 Attachment
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caemis
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lack of DT shifter
Band-on shifters were still common even on nice bikes into the 1980s, although the absence of a dérailleur hanger would be surprising that late.
To be fair, there's nothing on there that precludes being as early as 1950 without very detailed examination of the components, the Nervex Pro lugs were in the UK from 1950 but still in use well into the 1980s at least.
The trouble is, without a solid provenance, it's really hard to say; steel frame tech had more or less reached a plateau by the late 1930s from which it wouldn't move for more than half a century
gbj_tester
If I had to guess based on nothing but those pictures, I'd probably say 1970±10