I realize this was posted some time ago—but for the sake of accuracy 'n' KB knowledge, I thought I'd point out that Model M p/n 1390477 is now known to be:
• The first Model M (by any maker) to have drainage channels
• The first Lexmark-made M with one-piece caps
• The only Lexmark-made M with one-piece caps and a detachable cable
So no, it's not the same as the ubiquitous 1391401. In fact, 1390477s are rather rare. (I resist using the R-word, as it'll probably give people the idea they should dash around hysterically now, trying to find one... What I mean is, you don't see this particular p/n nearly as often as many of the others.)
Now that that's done, if you feel compelled to ridicule me for adding significant details to a topic that lacked 'em, and you have nothing better to do (for example, getting a life), hey, go wacky. Cheers, A.
But there are far more interesting models too! I really dig the 1392595 keyboard. And one of my favorites is a rather (more) rare 1393464 Sabre or the plain-Jane 1385162 terminal board. The M13's are cool, everyone wants the black one, but even now you don't seem to find many white ones around.
The true Lexmark Model M keyboards with the Lexmark Logos and say Manufactured by Lexmark are interesting...
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(http://i.imgur.com/FADZc8O.jpg?1)
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(http://i.imgur.com/AMgN1H9.jpg)
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(http://i.imgur.com/DC5asBm.jpg)
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(http://i.imgur.com/GoF8Gum.jpg)
...not to mention the 51G8572
A bunch of geeky stuff. There's more but the 1370477 is pretty cool as a standalone too.
Both with the little dots on the labels, I see!