Feather are probably better known fopr their razor blades rather than their razors. However they do produce a line of razors.
I've known about their current Adjustable but not the 800-1 or 900-1. They both came as a surprise to me. I can't find anything online about them
If anyone has more information - please contact me.

Feather 800-1	Feather 900-1	Feather DER-A