Al, I think these are a later type sealing system. Not attributed to any particular model, just a new and better system introduced at some point, and not across the board either. For example, Ford may have introduced them, while Wolseley did not
I have some that probably came with my MkIIIw Built in August 1941.
You will find that MkIIIW AOPs were being built at the same time as MkII Mortar carriers and MkI Universals.
The Mk. has nothing to do with a time frame, but everything to do with advances (changes, like the stowage plan) in that particular type.
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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