Mu immediate inclination was an Acer-Mex product, based on what appears to be Cinelli style binder-stay cap arrangement and the chrome treatment. The drive train looks like mixed Japanese to me. I also think the shift levers looked like Superbe/Cyclone but the rear derailleur appears to be Shimano. The crankset looks like an SR or Sugino. The bottle bosses do appear to be owner additions.