I had started this post in Dive watches forum but since it is related to Citizen, I am continuing it here which is more appropriate :
Prior to Citizen, I collect mostly Vintage Diver Watches and Chronographs especially Swiss and have also some Seiko. I started last year to sell most of my Seiko but somehow I came across Citizen which is its main contender ( Orient being under Seiko since early 2000 ). Most of us enjoy Citizen mainly for it Eco Drive technology. So I am starting with those two divers before going into the vintage part of the brand.
*BN0150 and BN0100 "Excalibur" :