Olma is a very small brand. They are not really a manufacturer since   they never produced their own movements. They do have a long history,   starting in the early 1900’s, and are still in business today after a   restart in the late 1980’s or early 1990’s. 

According to Swiss historical information, the brand was started by   Paul Jeannin Bourquin, who already had a long history in watchmaking.   Paul Jeannin Bourquin started a business under his son’s name, “Numa   Jeannin SA,” in the city of Fleurier, Switzerland.    The OLMA brand name was registered on 22.1.1926. They started making   pocket watches, typical of that era.In 1942, the OLMA watch factory   branched out from Numa Jeannin and was named NUMA JEANNIN OLMA S.A. 

In the above advertisement from 1957, it is clearly shown that the   name OLMA and Numa Jeannin were always close together. When digging   deeper into OLMA history, there is mention of various small but   important inventions and/or patents. These innovations were not in the   movements but rather in case manufacturing and, more specifically, to   the crowns used—the Monoflex crown gear and BP radial compressed crown   gear. This suggests that the company took pride in its work. One of the   things they worked on was making watches more waterproof. This is   indicated on many of OLMA watch dials.

OLMA certainly did not limit itself to simple watches nor to   waterproof watches. I found several triple-date watches and   chronographs. The OLMA VOX, for example, is a watch with alarm function.

The model names which Numa Jeannin SA claimed during 1950 and 1960, and which you can find on their dials, are the following:

• Olma Aqua King
   
• Olma Aqua Star
   
• Olma Arctic Star
   
• Olma Caravelle (1962)
   
• Olma Deep Ocean
   
• Olma Reserve (1955)
   
• Olma Sea-Cup
   
• Olma Seven Seas (1957)
   
• Olma Sonic (1955)
   
• Olma Sport (1961)
   
• Olma Vox (1955)
 

The Olma Sea Cup ranges were aimed at waterproof watches associated   with water sports. The name Caravelle was added. On the back, a sailing ship is engraved to express the purpose of   the special case. 

Also in the Caravelle series were watches that are typical of the   1960’s and 1970’s. These are real diver’s watches with inner rotating   bezels.

These watches represent a high quality of product design. It is   shows that Olma was a watch company that put emphasis on their   innovations on one hand, and following the need for water resistant   (divers) watches on the other. Olma took things a step further by making   bracelets with their company logo on them. For the vintage watch   collector, this is a true sign of quality.

All Antique watches are mechanical. Many repairs will not be cheap, as most likely they will require replacement of non-standard parts (unlike most late model watches).

• Antique watches should not be beaten or dropped - because repairs may be expensive.
• Antique watches are generally NOT waterproof. This is because waterproofing was not in general production until the middle of the 20th century for most watches. Therefore you should protect your antique watch from exposure to moisture.
• If your watch becomes wet it should be dried off quickly. Carefully open all covers and use a hair drier to blow dry the movement, dial, covers, crown. This will reduce the amount of rust.
• If your watch becomes wet with any kind of salt water you should immediately immerse or spray your watch with fresh (no-salt) water to remove all the salt from the works before drying the watch completely. Any salt left in the watch will combine with moisture in the air to rust metal components of the movement, case etc.
• Winding any mechanical watch tight may break the mainspring. If you can avoid it do not wind the watch hard.
• When adjusting the hands of your watch, move them in a clockwise direction only. Counter-clockwise adjustments may damage the movement. It is desirable to adjust the hands of your watch at the same time every day. An automatic or self-winding watch should be worn for at least 8 hours a day. It is a mechanical watch in which the mainspring is wound automatically as a result of natural motion of the wearer's arm, to provide energy to run the watch, making manual winding unnecessary.
• If you must adjust counter-clockwise make it for small adjustments only (i.e. for minutes, NOT hours).
• Be careful and gentle when adjusting the movement speed (faster or slower). Don't make sharp movements, and don't touch other components in the movement especially the pendulum mechanism.
• Every 2-3 years it is necessary to service and oil vintage watches. If the course of your watches is worsening and the accuracy of the reduction in the duration of the clock (autonomy) from one fully wound spring - it need a service.
• IF the watch is dirty - allow the watch to run down, don't wind it again until you have it serviced by a qualified watch repair expert. Dust will absorb and remove important lubricants and cause the movement pieces to wear down.
• To clean the case, dial and crystal you should use a cloth that does NOT leave fibers as these may get caught up in the movement. Check with your Watch repair expert to get an appropriate cloth.
• Keep your antiques watch away from magnets. Strong magnetic fields may affect the accuracy of your watch since some vintage watches were made with iron based components in the movement.
• Most Cases and Covers are fine components and will not handle abuse well. The watch should not be shaken, beaten, or stressed.
• Antique watches generally experience an error of up to 5-7 minutes a day. Any accuracy of +- 5 minutes is very good.
• Mechanical watch is not recommended to use for engage in extreme sports, and expose them to excessive vibration loads. Recoil force, which take on the clock, affect their reliability and precision. No matter how perfect was not anti-shock mechanism, there is always the chance of excessive load that details of the mechanism can not survive.
• Watch with calendar. It is not recommended to adjust, the date between 20.00 and 06.00, because at this time involved a mechanism for automatic adjustment date. Translation pointers calendars manually in this position arrows may damage the mechanism. Date changes should be made, relegating pre-clockwise to lower sector of the dial (for example, to position 6 (18.00) hours).
• Chronograph watches. In most cases, these watches contain the "start/stop" button and "reset" button. It is strongly recommended not to press the "reset" if the chronograph is running. Before you use the "Reset" button need to stop the chronograph by button "start/stop". Using the "reset" when running chronograph can damage the mechanism of most models of watches.

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