It's missing a few caps, and there's no cable—but looks unusually clean (check out those feet!):
Dell Lexmark Model M PN 1397651 Vertical Lettered Clicky Keyboard, No Cord $69.98 or Make Offer, + modest shipping
Lexmark made Model M's with both Dell's original and updated logos. This original-logo variant is seen much less often. It also has the distinction of having the most verbose label of any Model M, ever. (They must've worn out a few dot-matrix printers on those, huh?)
Made before Lexmark introduced their lower-cost design, it's mechanically identical to a 2nd-generation IBM-made M.