Somewhere (I hope) I've some form of flight computer that from recollection is a metal box with a roller section within and straps for fastening to one's knee. Ages since I've seen it. There was also a plastic whiz wheel - they belonged to my dad and were passed to me after he died along with his log book and headset which I know broke while I was using it as a pax in a C150.
The computers are probably circa 1970 as that's when he got his PPL though he was gliding for some years before that.