Whilst you're right, its not for the right reasons.

Its strictly S60, but not those with 3D acceleration. The N73 doesn't have 3D acceleration, but will support some of the N-gage features. The N81 is the first to support it, and that definitely doesn't have 3D acceleration (just a circa 400mHz processor).

Shame that the N810 is prefixed N-series, as it implies its similar in ways to the N-series phones. And it isn't even slightly related to them. Other than they use electricity ....