Seiko 5 Sports Speed Timer Slide Rule Flyback Chronograph 7015-7010 JDM rule Seiko first began production of

Seiko first began production of the Lord Marvel 23 Jewel Diashock in 1958

but it is to be expected on a diver watch like this

The crown screw down functions perfectly

but is still very nice

Seiko 5 Sports Speed Timer Slide Rule Flyback Chronograph 7015-7010 JDM rule Seiko first began production ofBRAND: SEIKO MADE IN: Japan MODEL: SEIKO 5 Sports Speed Timer Slide Rule Flyback Chronograph 7015 7010 JDM SERIAL #: 2D1033 MEASUREMENTS: CASE WIDTH: 43MM CASE WIDTH INC CROWN: 43MM LUG TO LUG (VERTICAL): 43MM INSIDE LUG: 19 **This is a rare and unique watch. The watch features a slide rule function which is controlled by turning the crown while it is pushed in. The watch also features a fly back function which allows the user to restart the