This confuses me a bit. I have never
ever seen a Model M bigfoot (only Model F). At first glance, this would seem to be an incorrect title for the listing, however the label on the keyboard would like to say otherwise.
http://www.ebay.com/itm/251690785334The label style is correct compared to
webwit's bigfoot, but his still says Model F (although a 139 part number and a 1994 date for a Model F is interesting in and of itself. I never realized Lexmark continued making them so late).
On the other side of things, the box says 4176191 which makes me think the keyboard's label is wrong as that is a number used by older, 80s bigfoot.
So, is it mislabeled or is this an actual Model M bigfoot? I'm betting on a mislabel, but there's only one way to find out.
Also, would this keyboard have been
manufactured for 1996 or would it have been refurbished or pulled from long-remaining stock? Because if they actually went and made this keyboard from scratch in 1996, that would be a really interesting Model F to own. (Usually, there is an inspection sticker on the inside that tells assembly dates. I've had boards vary by a few years. If this was an odd ball, I could believe a larger span)