That looks like a typical crimp pin for 0.025 contacts. There are many variations on it. One important variation is whether it is held in place by a barb on the side opposite the crimp or by an indent locking on the side of the crimp. Your pin looks like and indent version. (Edit: see edit below) A second feature is the distance of the indent lock from the plug end. A third, feature is the way the contact is made, i.e, the type of spring loading. Fourth, there is the way the wire is gripped. Some use a curled grip, which is like the wire crimp; others simply wrap the metal ears around the wire. It appears you have the latter type. If you have an indent type and get the distance right, it may be interchangeable with similar pins regardless of the contact mechanism or wire gripping technique. Be careful in crimping. The crimpers are different for the different types of wire gripping, but I have been able to use a crimper that is from the crimped/curled wire type with a wrapped-tab type of pin. Finally, the mating crimped pins for free hanging connectors are often flattened, rather than square as with a typical header. I recently came across some pins that were sold for these connectors, but were too wide to fit.
John
Edit: I agree with KMoffett about the Amp housing. It appears different than the finger indent type I referred to. My comments were related to the appearance of the pin itself. It appears to be yet a third type of retention mechanism.