4 encased cents, reverse of indian head, off center, horseshoe and a vulcanite encased

Encased Egg Pin

"One Cent Per Hen Club" 1973 D cent encased in egg shaped tie tack

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Egg Shaped Encased Cent

I was and still am intrigued about this piece. It could be a tie tack or a lapel pin. "ONE CENT PER HEN CLUB" when entered into "google search" brings up a lot of articles from the turn of the century (1900 - 1920) poultry journals about various feeds and remedies that cost less than 'one cent per hen'. I am not convinced that this is the answer, but clearly, this encased cent had something to do with chickens and eggs! The encased coin is a 1973 D cent. It is more modern than the mention in the Poultry Journal.

Any ideas? I asked a friend who is a judge of chickens at agriculture events, and he had no ideas.