Advice on vintage Omega Isofrane blue 24mm

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Dears,
I came across this vintage 24mm Isofrane strap. I think the code is 52005
It still has the original Omega buckle. It is in nice (used) condition. It is missing the 2 rubber rings.
I know that this type is rare, especially in good conditions.
It is for the 166.077 PloProf, right?
Does some expert on PloProf knows how much is worth?
Thank you
Nico
 
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Omega might well sell one today. I know they have them in orange, for example.

You might look at https://www.isofrane.com to see whether you can buy keepers, or a new strap to use your Omega buckle with.