MARK I 1960.
Applied logo,large minute and hour hands,clover on back case.High quality copper color Valjoux 72 first class.No logo diver crown.Original design hands at subdials.
Please note:during the very early production,two different sets of hour and minutes hands were used.Broad arrow(first pic)and classic Sherpas hands(second pic).
MARK I/B Same as mark I,but new subdials hands.
MARK II Little Saturn applied logo,same well refined movement like mark I,but new screw back with an oyster and writing ''sea pearl''.New subdials hands.
MARK II/B Similar to Mark II but new subdials hands and yellow plated movement(standard finissage,not very accurate like previous marks)
MARK III New caseback(Seapearl 300 and not only''Seapearl'' like previous marks)new details,yellow standard finissage movement.
MARK IV New dial,new hour and minute hands.Standard movement.Please note on the web many differences regarding colored chronograph hand,very often orange,and many little variations.