I own a pre model 24 6.5" Model of 1950. 44 special. They have the ramped front sight and rear adjustable rear sight. I found a Pre model 21 model of 1950 for sale and it does not have the front blade and gutter military sights. That is what makes it a Military pre model 21, but the add says pre model 21 with TRANSITIONAL SIGHTS. To me it is a pre model 24. My serial number is within 18 of the so called pre 21. What say you?