I cannot vouch for the certificate you have, but there are 4 versions (that I know of) of the 100th Anniversary 8OT floating around out there. These are the only pictures I have seen of them and I saved them from the internet somewhere. The 'banner' version and the 'DS', double shield, version, the one above and the blue rope bone version. As far as the model number goes on your certificate, I just saw a flyer for a 100th Anniversary 34OT that has an A34OT catalog number. I couldn't find an 8OT model. So maybe your model number is legit for some version, but I can't say about the certificate. Like others here, I don't put much stock in them and have seen fakes. Hope this helps some, to peek your curiosity if nothing else.