I am posting this mostly because I think it is very interesting and worth a discussion. The only question I have is, have any other people heard of these being available? The mailing date is Sep 18, 73, which would coincide with the article by Don Lancaster in Radio Electronics magazine. I'm assuming SWTPC had more of the surplus keyboards than the one Don used on his TVT prototype. Interestingly, this one is hand marked TVT-5 and it is also typed on the address label as TVT-5b. The keys are in an odd order and one of the keys are blue instead of red, but it does come with a sticker pack from SWTPC (part #2510). I bought this from an engineer that was very much into computers for many years prior to 1973. Just for full disclosure, I will likely sell this in the future as I am not collecting early computer pieces.