Hi i have an old road bike. Im trying to identify it to see if it is worth restoring or is it junk. it looks like the bike has been painted a few times, and there is no nameplate or any other identification except the serial number . it looks to be "b129088" and is stamped on the bottom of the BB. Description is as follows: Nicely lugged frame with lugged aluminum fork it looks like the downtube and seattube are aluminum and the rear fork and top tube are steel?; SR Aluminum crank arms, stem, handlebars; Thunderbird deraillers; SIW Japan rear hub. Any help anyone? Thanks

You will need to post lots of pics in order for people to come even moderately close to identifiy a bike like this. Also, I doubt that aluminum tubes are mixed with steel ones, that just does not work well. Check with a magnet.

I think I found out a little bit more on the bike. It has characteristics of a 70's Sekine. It has the same crank setup as a sekine(Aluminum SR arms w/ 75.7 stamped on them), The frame is all steel possibly Chromoly lugged. The brakes are aluminum Diacompe w/ safety lever type, Aluminum Handlebars& stem (SR ). I was wrong about the serial number. It looks like a squarish "D" and then 129088 stamped on bottom of BB.

there are some really clever ppl in this forum smitty but it really would help if you had pic,s,then they can ID it for you, BTW welcome to BF !