215 stanley howard??

[tobytools]

afternoon gents,
I've done the usual boodle searches but came short with this one, its what i would think to be the nicest tee square I've ever seen in the flesh.

it has:
215
STANLEY HOWARD on the stock,
and patented on a thin piece of plastic running down the blades edge.
,
it also has a swivel bit that changes the angle, and i believe its meant to run along a groove on a table?
something like this but not this one.
http://www.mathsinstruments.me.uk/page85.html

i will upload pics but its the name im interesting in, any info would be great..

thanks
TT