I agree with DD that it looks French. Looks like an interesting treatment of the lugs, sort of rounded edges with some fine feathering at the edges, but it's hard to tell with the reflection in the photos. If you remove the locking nut on the headset you should see an inscription telling us the thread diameter and pitch. This may help us to narrow down the nationality. I can't see what bottom bracket is on it but diameter and thread pitch of BB will also help. Not that some BB fixed cups have reverse threading.
Brent