Fred & all,
I have a WW 2 Blue Racer Deluxe in my collection. It is serial number (141,835) and has several unusual features other than the fact that it is
battleship gray. The frame on this key has a flatter top and is a thicker & taller casting than normal. The U damper is also a bit unusual in that the
side on which the damper wheel is screwed is canted slightly. My WW 2 Std Blue Racer (137,795) also has this odd damper but
has the standard casting on the frame. Both keys obviously have the lacquered tin Vibroplex plate. Vibroplex probably used different vendors for
parts during the war, which may have caused some variation. I will try to send a pic later to your email.
Dave de N5MO