WW2 RAF watch identification help please

I did not mention the C word and Not many museums are working on a 10 year plan with the CAA to get a display item airborne:0) They are an unlimited company but most of the people are volunteers / a lot looks to be done for love. I don’t know it they would want to sell but It would be handy to have a valuation range for them on watch 3 and 4. I agree it looks like the second hand has gone for a burton on the Longines.

So, I had a great day Saturday at the Lincolnshire Aviation Centre air show. Amazing atmosphere and some good displays - including from the Battle of Britain Memorial flight. The former RAF base at East Kirkby is well worth a visit. I had another look at some of the crash site excavation recovered items. I thought I could see more letting on the personal choice tank style watch. It looks like that will not be identified
https://omegaforums.net/threads/hel...-style-sub-seconds-watch.136399/#post-1861589

I also spotted a 6B/159 case back which was recovered from a short Stirling crash site. I had not noticed that before. I wonder when the watches were engraved with the serial numbers and if any records remain for those? I have seen a few different alpha numeric formats and also a far few (like this one) which do not have the broad arrow mark engraved.
.

I think the Tank watch ID is solved thanks to Dave the mod at the MWR site. Bentley looks to be the winner and a nice brand name for a young WW2 aircrew man to select….
.