Hello and welcome to the forum. I love the look of the 125 but don't have one so cannot help I'm afraid, however there are many people infinitely more knowledgeable than me who may help you. A word of advice though, you need to set an avatar and give a little information about yourself, and a photo of the actual watch would be good too.
Anyway welcome and I hope you find the information you need.
Just a thought but you would probably get a better response if you introduce yourself on the 'Open Discussion' or 'Vintage Omega ' threads if you look at the posts they have the numbers are far higher.