How do I price a full bed frame. The stamp on the rail says VONO and has a patent number?

If you haven’t solved your question yet, perhaps this might help. Your frame may be from this company: http://www.vono.com.my/welcome/about/
“Vono
Vono is a renowned international brand, having originated from the United Kingdom since 1896. Vono mattress uses the exclusive and technologically advanced Intalok Springing System developed with British advanced technology for healthy and refreshing sleep. The mattress follows the body contours and firmly supports body weight, thus providing firmer, healthier support for the whole body at all points. This helps reduce back problems. ”

You might try searching on the patent number by going here: http://www.uspto.gov/patents/process/search/index.jsp#heading-8. Surfing the U.S. Patent office site will also lead to international patent offices with on-line searchable databases.

If you are able to determine country of origin and date range of manufacture you may be able to establish a suitable price. Good luck.