Swift Audubons, see the Audubon Survey in the Swift section for (nearly) all models produced since late 1950's.
Doesn't mention the Audubon 10x50 aka Kestrel however, while it's my favorite wide angle 10 for birding purposes. Great AFoV, very easy on the eyes and steady as a rock (for some unknown reason it's the only 10 my eyes (hands?) don't object to).
For a moment I thought our friend Stuart C. Smith was still selling his Fully Multi Coated, vintage 2000 pair on eBay but on checking they appeared gone. See, that's what happens to rare quality items like this. But you can still try to contact Stuart, maybe he retracted them out of regret. Because that's what happens to Audubon owners.
Renze