OK. This post is 75% curiosity, but 25% bragging rights. My working Model M (typing this post) was manufactured on "09NOV88" according to the sticker on the back. ID # 1516399. I am a little sad I missed it's twentieth birthday, but in just four months, my keyboard will be old enough to drink! Can you beat me? I suspect you may... How old is your Model M (working or not?)

That's right. I said it. The thing weighed 20 pounds and had such an authoritative sound when you typed something, as if to say, "*BOOM* THAT'S RIGHT. I JUST PRESSED A BUTTON. WHAT NOW?" Really, these things were built like a tank. And I loved everything about them