1970s Nishiki vintage road bike
S011A013 or possibly S01/1A013. Its not cleanly punched.
The emblem on the front is a raised metal looking emblem with an eagle head over the letter M and a red and yellow flag.
The tires could be original. Two tone tan rubber sidewalls (dryrotted) and black hybrid tread.
Everything works and it still rides smooth. I had no idea what I was picking up. I just needed a free bike.