I believe this is the ref 101.029, which is the Pt Lange 1
Luminous (not the Lumen, as you've stated in the title).
The Lumen is the one with the translucent dial where you can see the numbers (ref 117.035), and which is a fair bit more expensive (and bigger as well, as it's a Grande L1). You can compare them, vs the entire L1 collection,
here.
Not a fan of the Luminous, as the subdials have too many circles, and I feel it lacks the elegance of the regular L1's, which are more subdued and more classic. AUD30k will certainly get you a nice 'regular' L1 pre-owned, and if you pay a bit more, you can get the L1 Darth in Pt with the black dial (101.035). I admit though that I'm biased as as owner of a 'regular' L1, as I prefer the classic look, vs the sportier look of the 101.029.