Help me try and date these chairs

Found both of these chairs at garage sales. Reupholstered both. They both originally had leather seats and backs with tapered coil springs in the seats, packed with straw for the cushion. They are made from quarter sawn oak veneer over pine probably. the first one is a unique knock down assembly where the 2 sides unbolt from the back and seat cushion. I'd like to find out approximately when they were made. The second one is VERY heavy.