Wow Stewart,
What a stunner. Looking at mine there are many similarities in dial shades & finishes.
Darren's 11630 W

I beleive you are correct to have a tachy bezel on your example. I feel my watch has a replacement M/H bezel which is wrong for this model.
There are so many (?) questions about the white dial Autavia's.
- should all white dial be 11630's ? ( i have privately discussed the 1163 versions with fellow forum members & still cant firmly say whether they are a genuine or rehoused 11630 dials ?)
- should all white 11630's have tachy bezels ( i beleive yes - not based on hard fact but after seeing all other examples wearing them - but hey, this is Heuer, we may never know)

No doubt - these are SUPER RARE Autavia's.
Are we adding OR subtracting to the pool of knowledge when we show this example - hmmm - i cant say.
Cheers - Darren