the Lambert brake calipers finally arrived from the UK (thanks Steve!)
they are identical to Viscount calipers only they say "Lambert".
since Lambert is the firm who went defunct and gave rise to Viscount, it's a nice part of the story to have these calipers on a Viscount.
that and the Viscount calipers are bloody hard to get a hold of.
they work as well as they look, if not more better.