This Kroehler model bearing a small metal plate with patent no. 2.597.860. It comes apart in 3 pieces, all nut and bolt tightened, the hard wood thick as asphalt and ingeniously designed to reupholster slick as you please. This one had long lost it's cushion, so we've decided to order a down envelope for a 3" foam cut to shape. The short blonde wooden legs interlocked to the frame and then were nut-and-bolted as well - much better than screw-on legs, especially with the jumping and flopping that often occurs with kids.
The bare frame of course, had to have the vacuuming of it's life...I mean, this had been stored in a dirty garage for years, before that an attic storage since probably the 80's. The built in spring unit at back and seat get new covering of general use denim I've had around here and a 1/2" layer of foam, then just cotton.
We decided to dispense with the channels and just do buttons. Remember, the cushion's getting down-wrapped foam - that's just plain foam in there now, while we wait the arrival of down product from New Jersey.
That down wrap came in just as this was going to post - look how it fills the cushion cover. An expense to pay past plain foam, but so worth it.