Hi Flying Pencil,
This came from just out the front of the RAAF “Flying Boat Base” in East Arm, just next to the Z Force base and Lugger Maintenance Section. A new barge ramp is being built and so we’ve done some dive recovery of objects before construction starts. It’s mostly aluminium alloy, with the bracket etc., being essentially cast with an aluminium sheet wrapped round it. Thank you for your suggestions re. Dornier and Shorts; I hadn’t looked into either (I’m obsessed with PBYs and get a bit blinded). I shall do that now. Thank you!

Could you give a Google Map link for location? Thanks.