zOwie Omega Discussion Forum

Gentlemen:
I read somewhere that Omega never issued this watch with the crown at 3 o'clock configuration.
At Omagamania auction which supposedly featured watches serviced and authenticated by Omega, they showed one just like mine and called it
“PLOPROF INVERSÉ” . So what is right?
Below text from Omegamania auction.
http://catalog.antiquorum.com/catalog.html?action=load&lotid=130&auctionid=158
OMEGAMANIA

LOT 130

“SEAMASTER 600 – BLACK DIAL” - 1ST GENERATION, SO-CALLED “PLOPROF INVERSÉ”

Omega, “Seamaster Professional 600, Automatic”, No. 32069462, Ref. 166.0077. Sold on May 25, 1972. Very fine and exceptionally rare, large, asymmetric, center seconds, self-winding, water-resistant, stainless steel professional diver`s wristwatch with date and a stainless steel Omega “shark” bracelet à petites mailles. This watch is sold with a box, Certificate of Authenticity and 2-year Omega guarantee.
C. Two-body, massive, polished and brushed, revolving graduated bezel for decompression times with red security push-button between 7 and 8 o’clock to lock the bezel, hooded lugs, screwed-in and protected winding crown at 3 o’clock, bezel inclined and reeded, flat back with horizontal anti-slip groove pattern, sapphire crystal. D. Matte blackwith painted luminous baton indexes, outer minute/seconds divisions, date aperture. Luminous white hour and seconds hand, luminous orange minute hand. M. Cal. 1001, copper-colored, 20 jewels, straight-line lever escapement, monometallic balance, shock absorber, self-compensating flat balance spring. Dial, case and movement signed. Dim. 45 mm x 55 mm.Thickness 14 mm.
Estimate: 8,500 CHF - 10,000 CHF
Estimate: 5,500 EUR - 6,300 EUR
Estimate: 7,000 USD - 8,300 USD
Grading system

C 2 D 3-6-01 M 2
Click here for written condition report

See high definition image

Ref. 166.0077 Production of this reference began in 1970. While other companies worked with helium escape valves, to solve the problem of the crystal “popping” during decompression due to helium absorption, Omega preferred to create an impenetrable case. They succeeded in creating a vacuum within the case such that, it would take one thousand years - at normal atmospheric pressure - for air to again penetrate the case. One of these watches was tested in a pressure chamber, where it continued to function until 137 atmospheres, the equivalent of 1370 meters of depth.