Anything 1st execution Autavia has been heavily in demand along with other rare references, such as 2nd execution 2446, 2446 GMT (screw back case) and the rare 7763C and 2446C SN variants. Of course supply is minute on these watches (at best we may see a handful of "new to market" examples each year and at worst maybe less than a handful exist at all!). With this in mind it is easy to see why prices have had only one way to go, especially as the pool of Heuer collectors is growing by the day. On the above mentioned watches in reality the shown values are on the conservative side, and if the strength continues the March 2015 update will reflect this upward curve more fully. We have also seen increases in all the rarest 70s Autavia references and several prototypes have changed hands in the past 3 months with high values attached, all of this adds to the overall trend for collectors to "land the biggest fish". None of this is a surprises and the same scenario is playing out on other brands. We are also starting to see a further widening of the gap between mint condition dials and ones with issues (scratches, dirt, dents etc) which are climbing at a slower rate, again I expect this trend to continue. The rarest 60s Carreras such as 2447 SN/NS, Sailing, Seafarer, Skipperera, etc etc and the most desired Monacos are also on the move, Transitional 1133B especially, which look value compared to the PVD Monaco and the Chronomatic. As we have discussed in the past the major difference between Heuer and a brand like Rolex is the supply, whilst a Paul Newman Daytona is always available at a dealer or an auction house, the same cannot be said for the best vintage Heuers, it is "needle in a haystack" time. With December to March traditionally a strong time for the watch market, it will be interesting to see what happens between now and March, although the traditional summer slow down may be the next time we see a "breath for air". Please note this guide sees some upward revisions to the grading column, check each guide for further details. The next update will be March 2015.