Seiko Prospex Speedtimer 1/100 sec Solar Chronograph Seiko introduces into the Prospex collection four new solar chronographs inspired by Seiko’s rich and continuing tradition of sports timing. All four watches are equipped with the new solar chronograph Caliber 8A50, which measures elapsed time in increments of 1/100th of a second. The new creations feature a 1/100th of a second chronograph counter at the two o’clock position, a seconds counter at 12 o’clock, and a 1/10th of a second counter at