Up for sale here is this used vintage choke, marked BR41C101 or something like that.  This was removed from a Jackson CRO-1 tube oscilloscope circa 1949/1950.  I tested this choke on my little test meter and it tested at 18.9Hy 408.2 ohms, but it will test differently under load. 

This is used with moderate wear and is guaranteed to work.  Please see my pictures for details and dimensions.

US shipping and handling is $9, and international is $28.  If you have any questions, please ask.

I have more chokes and other vintage electronics listed--feel free to take a look!