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 paint; 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.