Most of the offerings in Seiko's 6139 line up are quite easily recognizable, but one variant stands alone in it's architecture. The "Pulsations," as it's more commonly known, is an eye-catching doctor's chronograph with features all it's own, and an undeniable presence on the wrist. This example from February of ‘72 boasts a silver sunburst dial beneath a glossy lacquer finish. The markers are applied polished blocks paired with thin polished baton style hands. The chronograph hands stand out in a flash of brick orange that’s in perfect contrast to the otherwise monochromatic layout. Framing the dial is the rotating inner bezel in matte black and silver that is laid out in a "Base 10" scale for determining a resting heart rate. The case sports a low profile bezel, sculpted lugs, and has a thinner profile perfect for sliding just under a crisp cuff. It is unpolished with the original factory finishes still clearly visible, and completely original aside from a replacement crystal. The 6139B is keeping near perfect time post service, and the chronograph functions are crisp and responsive. For a casual finish, we’ve paired it with an olive drab RAF NATO that’s both comfortable and versatile on the wrist. 

Clockwork Synergy Olive Drab Double Layer Two-Piece RAF NATO (clockworksynergy.com)

Serviced 5/12/19

Diameter 40mm

Lugs 19mm