Are there any other markings... say "M9A1" "Phrobis Intl" or "Spain"?
Can you upload photos here or in the photoserver on the site?
Bill may well know what this is but you have me stumped... I know lancay had some M9s marked US but they should not have the patent on them.
See the photos of this thread:
http://www.quarterbore.net/forums/showthread.php?t=720
And read this thread:
http://www.quarterbore.net/forums/showthread.php?t=40