Looks like a Bathurst produced bolt head and Orange produced C/P, both proper for a Lithgowicon rifle. At first blush, the bolt body sounds like it's BSA, but the location of the number makes it sound like it could be a "batching" number stamped on the bottom of the bolt handle during production...is there anything similar on the top right (rear) shoulder of the action body, just under where the bolt handle would rest when it was closed and locked? If it's there and they match, it's the factory original bolt body.
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