Dear All
Thank you so much for your warm welcoming to the forums and highly qualified help.
With clues from your answers I figured out that the gun was made in 1962 and it does appear to be related to the silverhawk in spite of the different engraving. I bought it in Denmark and suppose it has never travelled to the US as suggested. I think I will have to live with not knowing specifically what bird is engraved.....I could not resist trying to figure it out - there is something alluring about the history of old guns.
I really appreciate your help. Thank you for your time.
Kind regards
John