also, hands are different: earlier version (mine) has smooth highly polished hands, on your one it seems to have the hands with the black central stripe.

In a way I believe this earlier version with the ridged markers and polished hands belongs with the chronomatic version in the "guide to chronos" ... but there is a smooth evolution through the your "middle" version so hard to know where to draw the line.

For example, the "middle" version has the markers of the later version, but the sub dial marking of the earlier version.