If you search google images for Lemania series 2, you will find dozens that are the same. Unfortunately, your photos are just too dark and blurry, but you can easily do your own research.
For example:
https://www.ssongwatches.com/products/lemania-royal-navy-series-2-monopusher
https://finest-hour.co.uk/product/lemania-fleet-air-arm-chronograph/
https://vintagewatchlife.com/en-us/blogs/ニュース/クロノグラフの最高ムーブメント-スイスのレマニア-lemania-の魅力とは
https://www.luxuwrist.com/store/p32...pusher_Chronograph_Caliber_15_CHT_-_SOLD.html
https://www.analogshift.com/products/lemania-monopusher-for-royal-navy
Great watch and heirloom. I think this is what's known as a Series 2 Lemania monopusher. If you google that, you will probably find more information. See if you can post some clearer photos with the hands moved to show all the printing. I think that the engraving on the back of yours indicates Air Force as opposed to Navy, but I'm not a real expert on these.
Here is my white dial Series 2, issued to the Australian navy.
My dad always said it's the face that made it different, I've looked and looked but none the same, a lot similar but not the same.
I'm not sure what you are seeing that's different. But given the blurry and dark photos, I'm afraid that we really can't evaluate it properly. It's even possible that it was repainted at some point.
You can also try to join the MWR forum, where there are some people that specialize in these particular watches. It's not easy to become a member, but if you reach out to the moderators and are persistent, you can eventually be invited to join.
My dad always said it's the face that made it different, I've looked and looked but none the same, a lot similar but not the
That's really interesting. Are your hands replacement tritium tubes?