I noticed that while the recent photos of 2622 Squadron show a 3 tassle sporran, the photos of Halston prior to 1980 show a two tassle sporran, not unlike the one on EBay (can't make out the sporran badge, though). It would be (and appears to be) genuine horsehair.
I'd like it, but I already have one, and at £68 can't afford two.