Original factory Harley Linkert M-5 carburetor. Very rare find. I pulled the bowl off and can see that it has the correct numbers inside-as shown, but I'm not going to completely disassemble the rest of it. I would just assume it will need a rebuild/cleaning. I don't see anything cracked, broken, or missing, no stripped threads, and no previous repairs/weld. Shows expected age/previous use. I do not know what specific bike this was originally removed from,I do not have part numbers, and I do not know all possible year/model, or custom fitments.