That is an Australian pattern Vickers mount.
It has a little handle like your bench vice. The threaded part is reduced in dia.at its inner end, and carries a rectangular brass block with a curve on its inside, to catch the gun pintle. The threaded part is swaged into a recess in the brass block.
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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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