Value?

Hey Guys

I have 2 Vickers .5 D.the big ones .1plain 1 with purple tip.whats approx value.
Also 5 Vickers .5 short ones green p/a. Hs k various dates with links …value ?
Thanks

The 12.7x81 (short) arent that rare iirc. I have 5 including a very early one, the .5D i dont know, I still need to find one myself.