Sorry I know this is a Heuer forum but I've been thinking about getting a Seiko 6139 600* but although I've found some posts on what not to get I'm struggling to find a buy/sell forum or somewhere that I can go to ask for advice. Can any point me in the right direction?

PS as part introduction since I've made 1 or 2 posts on the forum but there doesn't appear to be an introduce yourself thread, like other forums. I live in London. I have an interest in old cars and watches. I started this hobby with an Omega Seamaster Chronostop. I know Thomas through our interests in Porsche and he has tempted me into Heuers first with a Calculator (I'm have a somewhat engineering background) and then a Montreal. I've also added an Autavia. So far I seem to have got away with it and Mrs B hasn't cottoned on that the collections is growing!