Hi Andrew. I assume the 11/16" refers to the thread dia.? I have a listing here in a book that refers to an 11/16" x 24 tpi. It is called "American Extra Fine (N.E.F.) Thread"
Not much help sorry.
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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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