I think it must be off a larger aircraft because the support structure is far too high for a single engine type.
Keith is on the right track - the almost Heath-Robinson overdesign of the structure indicates British, not American aircraft. The seat pan itself may be a universal type and could be found on several types.
I will have a look at the Beaufort and Wirraway at Caboolture next week to see if we have a match.
Lang
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