I began building my collection of 3rd generation pistols (and one 2nd) in 2007. For the first couple of years I would not have adjustable sights. Then, I found a 4506-1 that had adjustable factory night sights. I suspected it was a little special (factory letter confirmed it is a "Special Order Los Angeles Police" shipped in mid 1997). So, I broke my rule and bought it. The adjustable sights grew on me and I started keeping an eye out for them. Now I have a 645 and 4006 with adjustable sights to go with the 4506-1. They are definitely cool.

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1st Signal Brigade, RVN '70