So fun fact, the Chieftain MK10 in game, Is a Mk11. 11 FD 65, Which is the Registration number of the MK10 in game, is IRL a Mk11 with TOGs. and this isn’t a user skin, or a camo or anything, this is the basic camo that come’s on the tank.
It Simply is one of the many examples of Chieftain Mk11s that kept the old style IR Spotlight Box, and just had the TOGs system put inside it, instead of being upgraded to the smaller TOGs box that some other Mk11s received.
And it shouldn’t even be POSSIBLE for this vehicle to be a Mk10, as the Upgrade path for this exact tank is known.
It started life as a Standard Mk3, Then was upgraded to be a Mk3/3 with the Laser range finder, Then later on was upgraded to be a Mk8, Which was a Mk3/3 made to be equal to the Mk5 production variants. With the 750Hp engine, and other Improvements, and it entirely SKIPPED the Mk10 Package, being directly upgraded to the Mk11 package, As all Mk8s were.
ID Plates inside of 11FD65 says it was converted to Mk.10 in 1987. No mention of Mk.11
I’d say the website you’re screenshotting simply misidentifying it as a Mk.11 because of Stillbrew etc. or it’s another tank painted as 11FD65 in the manner that RCAC Museum have repainted the actual 11FD65 as 00FC15
None the less, the game really should have a TOGS-equipped Chieftain