The 1396790 was the UK-made US-layout Model M for people outside of the American continent that wanted a US layout keyboard. You aren't in the Netherlands perchance? I understand they are common there due to the fact that no one really uses the official Dutch layout.
In fact most people if not using the US layout use some form of UK-style or "reverse L" variant.
Edited by joodie - 9/14/10 at 4:12pm