Gruppo Gamma User Manual

Screw Down Crown

  • To unfasten, turn crown anticlockwise until it pops out. About 5 turns is needed.
  • To fasten, press crown against case and turn clockwise. If crown feels stuck, don’t use force. Roll back slightly by turning anticlockwise, engage screw threads and try again.
  • Don’t over-tighten the crown. There’s no need to, and you risk damaging it if you do.
  • Don’t wear or store your timepiece with the crown unfastened.


  • Automatic movements self-wind while being worn. Arm movements cause the movement’s rotor to swing and, in the process, charge up its power reserve. Audible spinning of the rotor is normal.
  • An automatic movement can be started up by flicking the timepiece sideways to swing the rotor, or by manual winding. To manually wind, unfasten crown to winding position and give it about 20 turns clockwise.
  • If turning the crown doesn’t seem to wind the movement, check that the crown is properly unfastened and in winding position.
  • For manual winding movements, a full wind takes about 50 turns after which the crown won’t turn, so you should start fastening after 40-45 turns to ensure you can fasten the crown completely.

Time Setting

  • If your timepiece has an automatic movement other than the Miyota 90S5, pull crown out to the second position to set the time.
  • If it has a Miyota 90S5 or a manual winding movement, pull crown out to the first position to set the time.
  • Always pull gently and don’t exert force as you may damage the crown. If you have difficulty pulling it out it’s probably because you haven’t completely unfastened it; turn it further anti-clockwise.


Gruppo Gamma Watch Adjustment Diagram


Date Setting

  • Don’t set the date when your timepiece displays a time between 9 PM and 3 AM, to avoid unnecessary wear on the mechanism.
  • To set date, pull crown to the first position, turn it until the previous day’s date appears, then pull it to the second position and advance the time until the date changes over.

Strap/ Buckle Changing

  • To avoid scratching the lugs, place adhesive tape over the area where the screwdriver is to be inserted.
  • Use a 1.6 mm slotted screwdriver. Turn anticlockwise to unscrew, and clockwise to screw in.
  • If unscrewed lug bars can’t be removed by hand, use a blunt pin to push them out from the opposite side.
  • If bar is stuck when screwing or unscrewing, you’ve cross-threaded the screws. Turn back gently, ensure threads are engaged properly and try again. Don’t use excessive force.
  • If your timepiece is fitted with spring bars, use a blunt pin to push and compress the spring bar from one side of the lug, then pull out the strap. To attach, compress one side of the bar using a spring bar tool or fingernails, then gently squeeze it in between the lugs.
  • To remove buckle, use a spring bar tool or correctly sized screwdriver as appropriate.

General Care

  • Don’t operate the crown when your timepiece is wet. After swimming, rinse it in fresh water.
  • Don’t expose your timepiece to extremes of temperature or corrosive chemicals/ vapours, or wear it in hot soapy water, in hot pools, or around solvents such as petrol, as steam and vapour can penetrate the case and damage the internals.
  • Using any form of metal cleaner or polish on any part of your timepiece may remove a thin layer from its surface, and it wouldn’t be possible to restore the surface to its original condition.
  • Avoid placing timepiece near loudspeakers, computers, mobile phones or refrigerators as these generate strong magnetic fields that may affect its precision.

Routine Servicing

  • The movement in your timepiece is capable of running for decades without much maintenance. To ensure optimal condition, you can visit any watchmaker to have the movement serviced and gaskets changed every 5 years.