Dear Mr Noecker,
HMS AMPHION, later HMAS PERTH, was buit in Her Majesty's Dockyard, Portsmouth, UK between 1933 and 1936. The dockyard would have had, and maybe still has, its own foundry, but that does not mean that scuttles (naval term for portholes) could not be sourced elsewhere.
Notwithstanding your "interest(s) and respect", a more appropriate repository for the relic of the grave of of 350 Australian sailors would be the Naval Heritage Centre in Sydney or the Australian War Memorial in Canberra.
28 February 2017 is the 75th anniversary of the loss of the Ship and there are only three survivors still alive. It might be a fitting occasion for you to present the scuttle to its rightful owners.
Steve Youll OAM
Commander RAN Retd
HMAS PERTH National Association Inc.