So I had the chance to take some measurements of the bike, not sure if these will be helpful, thanks verktyg for pointing these out:
Top tube: 25.8
Down and seat tube: 28.8
Seat post: 26.8

I think sanding is definitely an option, would you be able to recommend a grit for the job Velo Mule? There are some spots that have scratched away where it looks like it might be chrome underneath the current paint. The spots are very small but outside of the some rust spots it looks like it might be in good condition.

Also had a chance to take some additional pics of the bike. Unfortunately nothing on the dropouts I can make out but there are some unique (to me anyway!) things I've tried to capture. Apologies if this is information overload! Thanks to everyone for commenting on this, it's become quite the learning process. Also nothing I could see on the hub lock nuts forgot to take that pic.




Rear drop out with what might be an earlier RD hanger?


NDS rear drop out


Drive side braze-on cable stops, two on same side.


Can take off to look a little closer but do not see model markings.


Can take off to look a little closer but do not see model markings.


Back side FD


Closer look FD