Bought used 2008 explorer I. Opened caseback to verify authenticity. Initial wind didn’t produce second hand movement until fully wound which seemed strange. Upon opening watch started up. Timegrapher shows watch running very well so back and forth wether to service now. The caseback gasket when the caseback was removed seemed stretched out a bit and not properly seated. Aside from this the rotor and some of the parts seem to have scratches/wear, not sure how that happened.