Omega
Omega was founded by Louis Brandt in La Chaux-de-Fonds, Switzerland, in 1848. Named after its revolutionary 19-ligne movement introduced in 1894, Omega quickly earned a reputation for precision and innovation. The brand became the official timekeeper of the Olympic Games in 1932 and achieved iconic status as the maker of the first watch worn on the Moon during the Apollo 11 mission in 1969. Today, Omega is part of the Swatch Group and continues to lead in luxury watchmaking and technological advancements.
Omega De Ville cal. 620 (early 1970s)
Originally introduced in 1967, the De Ville collection gained recognition for its elegant, minimalist designs and precise Swiss craftsmanship. Emphasizing versatility and sophistication, the 1970s models were characterized by their slim profiles, refined dials, and a range of case materials such as gold and stainless steel.
Technical Information
Ligne/Size
7.98‴
Jewels
17
Frequency
19800
Movement Type
Manual Wind
Power Reserve
40 hours
Restoration Notes
This was one of the first movements I ever restored! It was relatively straightforward to work on, featuring well-spaced components, easy-to-set bridges, and reasonably sized parts for a ladies movement. The watch was not working when I received it.
Cleaning and Polishing
Troubleshooting
New Mainspring
I ordered a new original Omega cal. 620 mainspring (part # 1208) to replace the old one.
Reassembly and Lubrication
Moebius 9010 on 4th and 5th wheel pivots, and on Incabloc jewels; Fix-o-Drop Epilame on escape wheel and pallet jewels; Moebius 9415 on pallet exit stone; Moebius 9501 for cannon pinion and keyless works; Moebius 8300 on mainspring barrel wall; Moebius D5 on 1st, 2nd, and 3rd wheel pivots.
Regulation
Timegrapher readings at full wind, across five positions - DU, DD, CU, CD, and CL:
Delta Rate: 20 s/d
Mean Rate: -34 s/d
Amplitude Range: 221° to 251°
Mean Amplitude: 240°
Beat Error Range: 0.2 to 0.6 ms
After one full wind, the watch worked for a total of 32 hours.
