Thanks for the help. When I check the internet for information on the GMT 1675, I have not come across something that is as informative and thorough that will help me check the authenticity and originality.
I live in the Philippines and not so many vintage watch collectors here who are experts in old brands like Omega and Rolex. If I rely on the pre-owned dealers, I am sure they will tell me everything I want to hear about the watch because they are just after my money.
As far as checking if its authentic I can handle that but for me to tell if that bezel, hands or dial is original for that model or not is where I get lost sometimes. I have made some costly mistakes before. For example, I was offered a few years ago a Rolex Explorer II 1655 complete with box and papers and we brought it to the local Rolex Center who certified the watch was authentic. The problem was the center did not tell me that the watch I bought has a service dial and bezel already. Its only now that I realized such original replacement parts will knock off several thousands of the dollars from the price compared to an all original watch.
Many thanks to all the members here who have been very helpful to all my queries. I am still a greenhorn as far as collecting watches are concerned but I am getting there.
