I've bought a few of the red ones over the years, and other than a NOS one and a frame-only one that I bought a few years back, all the others I've seen are cracked, so I think you have a rare one there. Don't look at it sideways or it might crack!
I bought one recently that had been repaired back in the early 1990's and the seller had stripped the paint to bare metal before the repair. When I went to look at it, I saw that at some point in its life it had cracked again next to the repaired welds.
That guy told me that he used to work in a bike shop BITD and that the red ones weren't so popular when they came out; he said they sold about 3 of them in 1990, but he remembers they sold about 20 of the black ones in 1991. So why is it now that the red ones seem to pop up now and then, but the black ones are almost non-existent? It's a mystery to me for sure.
btw, can I dibs this one for Retro_Roy? I know he's been looking for one (one that's not already cracked, that is).
Life! Life, do you hear me?! Give my creation LI-I-IFE!