Have you tried www.vandykes.com for a replica?

"I & H Prees" wrote in message
...
I have combed the internet and ebay in search of the smooth round glass
doorknobs with rosettes in the center to match the others in my 1957 home.
They do not have any facets or cuts. I did find one on ebay, without the
latch, so I couldn't use it. The latches are square and say "Dexter" on
them
and we want three with brass plates, and one with nickel.
Any suggestions would help.
-Holly