Hello...I have found an old watch from my grandad, and it turned to be Omega Geneve... I took the watch to some watch shops and they all told me that I don't have to bother opening it because it is 100 % original. They told me it's a common 601 omega but I can't find a same watch as mine nowhere on the internet and the problem is because I didn't open the case I don't know the serial nubmer and the year of production.
#Some information: -Its gold plated. -Its hand winding and works perfectly. -It has letter S engraved on the upper side and Omega(Logo)20 on the other .I Don't understand what does this 20 stands for. -It has light brown colored dial and date on it.