Old Fairburn record - Ferruginous Duck 1976

Hi, wonder if anyone can help. I'm uploading all my bird records to Birdtrack (VERY long job!) and have a decent list from Fairburn which includes Ferruginous Duck, but stupidly I only dated it "Sep 1976" in my notebook. A long shot but does anyone have access to old bird reports (or personal recollection) of exactly what date or dates that bird was present? My mind's eye recalls it as a drake. many thanks!