OMEGA SEAMASTER, REF. 166.078. SO-CALLED HARD METAL 

Omega, Seamaster Automatic, Ref. 166.078. Made circa 1970..Fine and rare, large, hardened stainless steel, shock-resistant.water-resistant, self-winding, center-seconds

Description: 

C. Two-body, polished and brushed, scratch-resistant steel.hardened by bombardment with Tungsten, flat and inclined.bezel, recessed crown, hooded lugs, screw-down back with the.Seamaster logo, flat mineral crystal..D. Satine silver with applied gilt and silver steel indexes, outer.minute divisions, date aperture, . Silver stick hands, center second in blue..M. Cal. 565, held by 4 synthetic studs for full shock resistance.copper-colored, 24 jewels, straight-line lever escapement.monometallic balance, shock absorber, self-compensating flat.balance spring, swan-neck micrometer regulator

Year: 1970