5510 Explorer dial Australian Navy

[RANCDdiver]

I’m looking for information about the Submariner 5510s issued to the Royal Australian Navy (RAN), the only 5510s fitted with the Explorer dial.

Sotheby’s auctioned one in December 2023 and according to them, unspecified scholarship had determined that the hammered fixed bars on it were to A10 specification. Can anyone clarify that for me? I did ask Sotheby’s but they didn’t respond and there’s nothing on the internet about it which I can find. What is A10 spec?

https://www.sothebys.com/en/buy/auct...ial-submariner

I’m also aware of the example previously sold by Wind Vintage. But as declared, it had already been unsympathetically restored so can’t be completely relied on when trying to determine exactly what the original specification was.

https://www.windvintage.com/rolex-su...alian-military

Greg Petronzi of True Patina, who serviced the very ‘weathered’ Sotheby’s RAN 5510, reckons just five of these watches survive. So apart from the above, does anyone own one of the other 3, now or in past? Or know someone who does/has? PM me if you'd prefer to discuss it privately.

I’m confident the real experts are here, so any information or thoughts about these super rare Rolex milsubs would be gratefully received.