Haynes & Son's? Hot Water Urn

[barneysam2]

I have an antique copper/brass water urn that was made
in London and stamped inside the lid is Haynes & Son's
LONDON. This is in beautiful condition and I'm going
crazy trying to find out it's value. Been on the internet
all day and haven't gotten anywhere. It stands 17 1/2"H
by 11 1/2" W. Has a solid brass spigot on the front
and a metal cylinder inside that houses a 2 1/2 lb
steel rod to keep the water hot. Want to sell but
don't know where to go to find out the value. Any idea's?
I'll be happy to send a picture if you're interested.
But you'll need to tell me how to do that. Thank you.