Got this for 40$ from somebody in my city. Was a complete shimano 105, but I stole some of the parts off. Replaced the brake levers, shifters, bar tape, front derailleur and stuck that sticker on the head tube not thinking anything of it. I know the tubing is pretty good, but other than that no branding on it whatsoever. The serial number posted on the bottom is M4B16308. Also had a vette rear pannier rack. Would love to know what it could be? Tange #2 frame with tange #1 fork

Pictures at : imgur(dot)com/a/WbpwG5R