That's a new one on me Chris, but it looks fab.
Back in the late 1980s I found a Pye set at the junk market in Nottingham. It was a 21" table model, not unlike a big version of your set, similar vintage I guess, but it had motor tuning (sequential) and the cabinet was a green rexine type of finish rather than woodgrain. Quite unusual and I've always wondered which model it was. I never had it working unfortunately.
Good luck with your nice little 510.