Searching for: Omega 166.068 Seamaster 200m "Banana" - buying advice

Long time listener first time caller here! So it's my 50th year on the planet and as such I was looking for a time piece from around my birth year of '72 to celebrate. As a diver the Seamaster seems the logical choice and I stumbled on the rather striking 'Banana' design, something I haven't seen before.

I wondered if anyone had advice when trying to find one, what to look for, what strap it should have, dealers and sellers I should be contacting [primarily UK] for this sort of vintage watch and what sort of price is reasonable etc.?

Thanks you for your help in advance!