I have what I believe is a S&W Model 15 revolver that I would like to find the year it was manufactured. It is chrome plated and has a 4" barrel. The right side of the barrel is inscribed, 38 S.&W. SPECIAL CTG. The serial # is 5D26XXX. Also I would like to know if this gun is capable of firing +P ammo. Any info. would be greatly appreciated.