I think it's a K100, or it's a close relative. There is something about that giant hunk of a motor that I like. Thinking I might build a custom one some day.
This example caught my eye the other day:
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fwww.weekendheroes.com%2Fsites%2Fdefault%2Ffiles%2Fstyles%2Fstage_breakpoints_theme_weheroes_lg_2x%2Fpublic%2Fk101_close.jpg%3Fitok%3DKAEAGQiw%26amp%3Btimestamp%3D1459590315&hash=732a82464ac3ff8e65faea0d622127a7b47c60fd)