Thank you for the question.
This is a FPL53 O'Hara Fluorite - with the fluorite element being mounted in rear position. The front lens is a premium O'Hara Crown element, as it should be.
Barry never coated any of his lenses, he uses extra baffling and an extra long dew shield to enable the exceptional wave profile of 1/40 wave PV to be retained and thereby resolution to be maximised. This is not a fluoro copy - it is the real thing
If you seek a coated unit may I recommend an APM, but this will cost you about $6k, they have an Oz distributor (Astronomy Alive). Or if you are that keen a Carl Zeiss like I have.
Trust this assists.
Cris,
Astromelb.