Great looking frame and fork, nice condition and with a ton of potential. I would hazard a guess this is very similar to the Graham Weigh, Cobra and Orbit CX framesets I have that are all lugged 531 competition tubing. Small differences in terms of finish and canti bridge/seat post clamp but essentially look the same. Happy to compare notes on what works well with these frames. yours looks good to go already whereas mine were all full resto projects needing a lot of TLC. I am sure you are going to enjoy this one a lot , I cant get enough of vintage steel CX bikes they are in many ways much more rewarding and capable than 80s/90s MTBs