Thanks for the reply gents,
I presume it's the original brush, it fits nicely in the holder and it looks as if it's about the era!
The blade holders are both intact, and the operation smooth and feels tight, ( I don't know if they loosen with age?).
As for the holders I'm 99% sure they are silver or silver plated at least, as the tarnishing certainly looks that of silver. Also when you look inside the top of the holder it is still very bright!
I have received a box of ten original valet blades, unopened, with a view of using them, but now I feel I don't want to ruin them....wrong???
Cheers again
Mart