It looks like we are all talking about non-internet finds.
So keeping with the format I would have to say my AdmiralPy Head is my greatest non-internet find. I ordered a correct spelling Admiralty Head over the phone at the Collectable Exchange and to my surprise they sent me the AdmiralPy version. There are only two known to exist. This find was before the Forums and the Harbour Light website. I identified it through John’s website, which is where the variation site that is now on the HL site, started from.