I really liked the Falcon 531c bike. Quick handling but stable at speed. Ride it with lightweight tubulars. Definitely what I consider the 'all day race' category.
it felt really fast = probably the deep drops or the red colour. Or just a good fit w/ comfortable cockpit.
It was my understanding that 531c (late 80’s) was a designation for all tubes being 531.
edit: FWIW - I bought frameset from another BF member. Was it @
Brewsmith, in CO?