Rob, Most of those cartridge filters were bypass filters. Another little thing is that some had a little lift out wire handle. There will be a cross over to one with/without the handle (loop) which should offer up another set of numbers.
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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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