Marshal tom,
I am not a fan of the Body Guard model. I much prefer the Centennial, though I have never seen a 640-0
The Centennial is the best pocket/purse design they have. I own them in several calibers and carry one today
I do own a single 649, but it is the 39th Model 649 produced, one of 25 hand selected between serial numbers 18 and 53 on the first day of production for special embellishment to honor the first stainless Body Guard introduced in January of 1985. I stumbled on to it and could not resist
I keep lots of J-frames on hand with different grips for use in classes
My 649 is in the middle and remains unfired since leaving the Factory
The pocket guns are all Centennials (not counting the 649) and the holster guns are mostly Chiefs Special Targets
As a Civilian involved in a firefight, if you have time to cock the gun and take an aimed shot, your life or the life of another is probably not in imminent jeopardy.
As a LEO, I usually had a CST in my ankle rig. If I am going to cock the gun for an aimed shot, I want the better sights. Yes, almost 4 decades ago 25 yard head shots were not a problem . . . today not so much
All of that being said, if condition is good and that 25% discount is a go . . . . I would have already bought that 649 just to have one in the teaching inventory that I can shoot