Yes, the middle one is the only lefthanded double square bridge Mauser magnum copy action to leave the Vektor factory that I know of. It was made into a .450 Rigby by a SA gunsmith, Gerrie Coetzee, (others also build by him), originally for Casy Lewis, the former head of the custom shop of Vektor, also a former SA airforce pilot. He sold the rifle to a SA hunter for approx. US$ 10 000 recently. Beutiful rifles IMHO.