Just another thing I stumbled over in my online wanderings - the tiniest travel razor I've seen so far.
I've found very little about it - patented May 11, 1921, made in the US, manufacturers logo is BP in a diamond. Reportedly it's a smooth razor, although challenging when shaving the 'off side' of the face.
One of the fellows over on my favourite shave forum found this YouTube video of it in use:
Do I want one? Yes I do - but I have no idea where to find one for a reasonable pile of cash...