hi, got this steel frame with english BB, it has no decals just moser stickers on paint. it has tange tr dropouts and engraved lugs. 73.5 on seat tube, FO and some mark /?G3 on top tube lugs. it looks ok and has some great touches. any ideas? serial is L6100673 thanks

27.0 seat tube

I'd say no. A Moser would have italian threading and generally lots of his "M" logo cut out of the lugs, stay ends and so on. Decals are weird or that's just me.

It does look like a well-made mid-late '80s Japanese frame. The clean brazing, cast lugs, Tange drop-outs and long serial number point to a large Japanese contact maker.

Nice Frame. Any Fork?

Agree with cbutler - nice frame/Japanese. Guessing 1986-88-ish.

Getting a Lotus vibe.

dont know if its original, its nice though no markings, just 457 stamp on the steerer

I've never seen a Moser without "Moser" pantographed into the top eyes, even the scalloped ones. Also, the only pantographs I've seen on dropouts and fork ends on Mosers are Gipiemme, Columbus or Moser (I've never seen un-inscribed ones).
Your down-tube decals show the "reversing arrow" emblem, which means post-1984. If these were original decals, the lugs and fork crown would also have the arrow pantograph.
Serial number is not a Moser #.
I don't know what it is, but it looks pretty nice!

agreed it's a very nice frame and nearly certain that it's Japanese and no Moser. I think the investment-case seat lug indicates the seat-tube socket angle (73.5°) and there's that mysterious "double-S" stamp on the bottom of the headlug that I had *thought* was an Eisho branding, but have been corrected and we still have no idea who makes these lugs, but they are nearly always on Asian frames. Seems like the fork is either a replacement or possible just sourced from another supplier (Tange or Ishiwata) by the frame builder so could be OEM. But note the carefully detailed stay ends at the dropout where these fork blade ends are just domed. All in all this may turn out to be as nice a bike as a "typical" Moser (subjective, I know) but I'd strip off those decals.

no moser - ok, but what is it? the more I look at serial number the more I think it could be LS100673, the 6 is not stamped correctly, maybe by mistake or maybe its just S. Inside the steerer I found 7 straight lines? maybe its by any chance a clue

likely those lines were made by the stem wedge and not a manufacturing "feature", but if the steerer has some (very subtle in most cases) raised ridges in BASE and are either straight or spiraling, those could be a clue to the fork maker.

Rifled steering tube is not so unusual. Some Columbus and Vitus tubesets have those. Not sure about Japanese frameset though....

I am not getting any closer Tange TR has been in Tange 1988 catalog, assuming the frame could be 1987+. it has pump peg and 2 bottle cage mounts. also it uses tange tube parts and the serial number is 8 marks. Maybe Miyata?

I concur. This appears to be an Asian frame and late 1980s based on the presence of a pump peg, two bottle bosses and two tone, pastel paint. I also agree that the marks inside the steerer tube are probably due to a stem wedge, as they are part way up the tube and and only on one side of the tube.

Regarding the serial number if it is L6, it may be a Bridgestone manufactured frame, while LS may represent the Japanese manufacturer used by Bianchi.

Edit: Given the apparent era, the lack of brand embossing suggests a contract manufactured frame for a smaller marketing or private label brand.

Probably not Miyata as they used their own proprietary tubing although they MIGHT have used Tange forks and other bits, but I think T-Mar (as usual) has the best ideas about what it could be!

Agreed, it almost certainly isn't a Miyata. A Miyata L-code would make it 1983 manufacture and the number would be low enough to a 1983 model. This is a bit early for the pump peg and dual bottle bosses.

thanks for that, checked it one more time and the seatpost is 27.0 so Bridgestone would be a clue, but still cant find one with Tange TR ends. I found models with Ishiwata tubes