Vehicle Markings (Signs)
There were four types of 'signs' painted on wheeled vehicles during the 1950s, 60s and into the early 70s. These were, formation signs (division, brigade, command), arm of service (coloured square with a number-indicates the unit artillery, armour, engineer and so on), battery (used only by the Artillery) and tactical (coloured square with a number); in your case Z11. Your Z11 is a tactical sign and even though you have found a photograph of another M37CDN, in this case one marked to an infantry battalion with Z10, if you look closely at the bumped you will see that the Z10 is on a square with a dark coloured backing which the shadow on the door has obscured int he photograph.
The tactical marking pre-dates the fixed callsign marking of 91E you found on the door, but again if you don't know or understand what it means, then, just like the 91E, you are better off not using it on your restoration. As Rob mentioned in his message, less is better.
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