I've got a yellow reynolds 853 frame by DEAN. I think the top tube is just shy of 56cm. I can measure to be sure. I have never ridden it - it was the second half of a purchase at a bike swap and was never used by me.
It's got some issues. Mainly rust. I can't tell whether it can have a long life ahead of it. The previous owner let it rust enough that the bottom bracket cable guide bolt seems like it rusted out (plastic glue-on ones are cheap).
It'd probably have to be sanded to determine the rust extent, and have to be repainted. if you paint your own bikes or have cheap access to a painter, it could be a worthwhile gamble. By the bottle cages mounts, the rust wants to flake off.
Mostly cuz I have a hard time throwing away anything, and think it might have a life, I'll send it to you for only shipping charges if you get a friend to subscribe to our mag. I can take pictures beforehand if you want to see it.