I am near Rochester, NY. Yes, the rear spacing is 126 mm. I also thought year of manufacture could range anywhere between 1975 and 1988, more likely '77 - '82, for no particular reason, just gut instinct, intuition, and certain features seem to suggest that era. Unclear what you meant exactly by "fittings"? Lugs/Dropouts/bolts/derailuers? All of the above? Lol. I suspected a custom one-off attempt/expirement by a small builder in England, but could very easily have been Spain, Sweden, even (stretching) Italy. But the low quality, mass production characteristics, could include Asia. That is not a blanket statement about asian bikes by the way. Just the cheap labor lent itself to high volume, low quality, entry level bikes, especially those wanting to follow trends, like the aero rage of the late 70's/80's.