Blenko Identification Problem - Can you Help?

Readers: Collectors: We received the following note and photo. Can we help this reader identify her collection?
Hillary:
I have a question for the blog…the attached are three crystal paperweights. Disregard the numbers I gave them in the file name for the photo. I have a pig, a swan or a duck and a ram. The ram I found in the 1976 catalog as a 76G. The pig I can only find in the 1980 catalog, but has a 76 number. There is a duck is in the 1982 catalog, with an 823 number, and a swan in the 1983 catalog with an 833 number, but it is in the same style as the older ones and has a silver label. The catalogs from 1976 to (I’m missing 1979) 1984 have different animals shown. Does anyone know ALL the animals that were made in this style, and between what years?

Thanks,