Same here. I live in Finland, and my local tournaments don't submit to Fargo. As I don't play in any larger tournaments that do, I'm stuck with no real Fargo rating. My best estimation is that I'm around 620-630, based on the fact that some local players who are 620-630 play roughly equal to my speed.
I rarely lose to sub 500 players and I usually lose to 680-720s, but winning them happens often enough for it to not feel special anymore. Against a 750-800 it's a whole different story, rarely play them but the difference between a 680-720 and a 750-800 is a very clear one.