A final try at identifying my mystery bike

[glenfield2]

Okay well one last shot at identifying my my mystery bike frame. I’ve got a bottom bracket number, a Campag marking on the fork drop outs, Tange bottom bracket stamp and I’ve pulled the forks and found no maker marks on it. No braze on fittings beyond brake cable guides on the top tube.
I did think it was Reynolds 708 but I now doubt this - the sticker matches a missing one on my other acquired bike. Not coincidentally I think.
It’s a 24in (60cm) frame, likely mid - late ‘80s and, I’m assuming, British. The late owner was a keen TT rider.
I think the white and hatched blue is maybe original - there’s a lot of messy white overspray but underneath its hatched or white.

 

[vtwinvince]

How is the BB threaded? The fish scale paint is cool, and was used by a few builders around that time.

 

[glenfield2]

It’s a Campag BB if that’s enough of an answer. (I’m not the best clued up on these.)

 

[vtwinvince]

Probably Italian thread. What does the underside of the bottom bracket look like?

 

[glenfield2]

 

[Canuk]

With the Tange bottom bracket shell I'm running with Ishiwata tubing and either a Japanese import or more likely a Dutch made Koga Miyata. If I was a betting man, it would go on the Koga. Nice frame. This hatched finish is very much of the era Belgian/Dutch frames, not high end, fairly mass produced but good quality

 

[Jesper]

Note: Making my comment based on other's previous comments; as I cannot view images except a partial of the first photo.
The retinato paint scheme is a classic Italian style used by many builders (e.g. Colnago) in the mid to latter '80s, and probably early nineties. I have a couple bikes with that paint scheme; both Italian made frames, but one is a non-Italian marque. A lot of Italian builders utilized the Prugnat lugs that your frame has so without knowing the BB threading I would guess Italian origin except for the Tange BB shell. I know Italian builders used Tange tubing, but not necessarily the BB shell or other frame parts from what I have seen for the bike's time period. I am sure there was some artisan builder probably saving a little money using Japanese products, and I know frames were made in Japan (e.g. Bianchi) and not in Italy (there is an Asian Prugnat lug copycat design that was regularly used by Asian manufacturers to give European looks (and names) to their bikes.

 

[glenfield2]

With the Tange bottom bracket shell I'm running with Ishiwata tubing and either a Japanese import or more likely a Dutch made Koga Miyata. If I was a betting man, it would go on the Koga. Nice frame. This hatched finish is very much of the era Belgian/Dutch frames, not high end, fairly mass produced but good quality

With the Tange bottom bracket shell I'm running with Ishiwata tubing and either a Japanese import or more likely a Dutch made Koga Miyata. If I was a betting man, it would go on the Koga. Nice frame. This hatched finish is very much of the era Belgian/Dutch frames, not high end, fairly mass produced but good quality

All very interesting because the late owner’s wife (who has slightly sketchy remembrance of the details of his bikes) did say that she recollected one having a Japanese frame.
I don’t know how the market worked back in those days; would Japanese bikes be sold complete in the UK or more likely as frameset for local building up?

 

[Jesper]

Finally saw photos.

The serial number does not brung a specific marque to mind; looks fairly generic and may be one of many conventions used by the same manufacturer for bikes being made/marketed for a specific region or dealer.

The stay caps look indicative of an earlier than 80s frame (it is not) and not Italian (not "pretty" enough) of the 80s era.

A Dutch marque makes sense given my one of my Dutch bikes looks similar (paintwise; painted in Italy), and is an Italian built frame (but all Italian/French parts: Columbus, Cinelli, Prugnat). The your frame would have been painted white with the blue top coated for retinato design and fade.

Since many small Dutch (and others) bike dealers imported their frames it would not surprise me that it is Asian (Japan) built, and Bianchi was already having part of their range being made there.

Bottom bracket threads should be on the cups. Not sure if Japanese made Bianchis had an Italian BB shell (70mm length; 36mm x 24 t.p.i) or not.