Hi Darryn - I thought I would get in early with a reply as I have a similar watch in my collection (see below). This is the Autavia ref: 1163 known amongst the Heuer community as the Siffert Autavia. In all the old catalogues that feature this reference it has the Tachymeter bezel. Heuer also made the 1163 MH - same watch but with black dial, white sub registers and the minute hour (MH) bezel. The traditionalist will argue that the Siffert Autavia (white dial and black sub registers) must have the Tachy bezel. The realist would consider that at the time these watches were being sold it is certainly conceivable that a customer may have requested the MH bezel rather than the Tachy bezel on his/her new Autavia 1163 white dial/black subs. My example came via a reputable dealer from the original owner. It has the original back case sticker and the original papers listing the watch as the 1163 MH. Your watch is therefore correct in every way but in order to be considered a Siffert Autavia you will have to change the bezel if it is that important to you. TAG Heuer Switzerland, who service the vintage watches in Europe, have Tachy bezels in stock. They do not have MH bezels so if you ever send the watch to them for service ask then for the Tachy bezel. You will have no trouble selling the MH bezel as the Heuer originals are now only available in the enthusiast/collector market. Hope this helps. I am sure other members will have their say, which makes this all the more entertaining. Regards Paul