Unusual Chairs I Came Across

Greetings...I'm wondering if anyone can help me ID these chairs. I visited an aunt in CT recently and they are part of a dining set. She said they came with the house when she purchased it back in the 70s. I was discreetly taking pictures and didn't want to upend her furniture in front of her. I would love to get more information but don't know where to look. Thanks!