The 1966 Christmas pen is based upon the Sheaffer Imperial. The pen
body is red with holly leaf designs on metal cap. In 1997 the Snow
Flake pen was produced based upon the Prelude model, This pen has a
metal body with snow flakes etched upon it. It was intended to produce
a new pen every year but no further pens were produced. They came in a
very nice book type box with a 1920s picture on the inside cover. They
were produced as fountain and ballpoint pens. They are regularly for
sale on ebay.

Hope this is helpful
Peter