Yeah, sounds like its been wound back. But hey, great for re-sale value! Just look after with regular services and she will be sweet.
A mate of mine bought in a R32 '89 4dr and it showed only 46,000kms and there were tears in the interior, overall rough condition, so dont worry, your not the only one.
I have just bought a R33 GTS25t sedan which apparently has 76,000kms on the clock, who knows, perhaps thats wound back too.