I have a lovely det of nos cranks, and am just around the corner too. I bought them direct from race face and as they wouldn't ship to the UK directly, I had someone forward them on at their leisure. They took a while to arrive and when I got them I didn't have a use for them so tucked them away. When I was sorting through my stuff recently I rediscovered them, but I also discovered that the arms, whilst both black and 175mm with the same square taper alignment, they aren't exactly a matching pair. The logos are different and one arm seems to have some milling to the side, the other doesn't. You can't really tell tbh which is why I didn't notice at the time. I was going to list them for sale as I spent a lot last night on some less than retro bits, so if you are interested I can sort you some pics out.
I also bought at the same time some nos spacers which came with some blue decals which you could actually use to cover the white ones and make them match.
I also have a full set of rf rings as well in black so they would make a lovely looking chainset. I thunk I've got a full set of silver rf bolts as well.