There are basically two types of watches mechanical and quartz. The mechanical watches are powered by a spring wound motor with gears, levers, wheels. The mechanical movements are either wound by hand or by an automatic movement using a counter weighted wheel that winds the spring every time you move your arm. There are advantages and disadvantages to each and their accuracy and maintenance is different also. The mechanical movements are usually more costly due to the labor and materials to build them. They are more expensive to maintain as like any engines they must be cleaned and oiled to maintain their lifespan and accuracy.  This involves disassembly of the movement, cleaning the parts, reassembly and applying a tiny bit of oil to the balance wheel and mainspring. This can be hundreds of dollars depending on the watch and what the factory and dealers suggest. After reassembly the watch is timed and checked for accuracy. The quartz watches are powered by small batteries that require changing when they run down. They usually last for a year or two and run about $15.00 to replace. The movements are basically a printed circuit and chip. There are also solar powered quartz watches powered by sunlight or artificial light.  Citizen, Seiko, and Casio makes good solar watches and offers many complications like world time, chronographs, chronometers, calendar, altimeter, barometer, battery power indicator, and compass.  Generally speaking quartz watches are more accurate and these solar watches are synced to the atomic clock in Colorado Springs each night at midnight for accuracy to the second.  The Citizen also has alarms you can set.  Case materials are mostly stainless steel, or gold plated stainless, titanium, or black coated stainless. Casio has a series called Mudman which uses synthetic materials for rugged outdoor watches that are shock, water, and dust proof. These are popular with military and policemen.  Price wise a good mechanical chronograph with calendar and automatic movement will be in the thousands depending on case and band materials several thousands. A good quartz chronograph, solar powered with calendar, chronometer, world time, etc. usually for around a thousand depending on case material and other features like GPS, blue tooth etc.  I’m not a watch maker and just trying to give you a simplified outline of what’s available. The market changes almost monthly now on prices and options, scarcity of materials and supplies, and demand. On the mechanical watches skies the limit on cost as you can get high end brands in 18k gold, diamond dials, bezels, and bracelets or exotic leather band with gold buckles.  Hope I’ve answered some of your questions, will try to get more specific in other blogs.