I have a spare, however not in Melbourne. This is an original Lumicon OIII, from before they changed hands.
From the case:
Lumicon OIII 1.25"
Filter line transmission %:
Hydrogen-Beta 486nm 0.2
Oxygen-III 496nm 92
Oxygen-III 501nm 87
Hydrogen-Alpha 656nm ~
Here is a link to the model:
http://www.telescopes.com/telescope-...niiifilter.cfm
I've had it about 5 years. It was purchased from Scope City in California after Lumicon had originally shut down and Scope City had bought out all of the existing stock.
The coatings, while not spotless, are clean and untouched. There are a few dust flecks that could probably be removed, but are not really hurting anything.
I've since picked up a 2", so this one doesn't see use any more. PM me if you are intersted.
Regards,
Eric