nprofile1qy2hwumn8ghj7un9d3shjtnyd968gmewwp6kyqpqw9hzf7g3kjwg7877u72vq89tzyt6aqkdvln96d295qr5eelqse2qh30y40 (nprofile…0y40) the plain, seam-welded lugs suggest it probably isn't Reynolds. The early Grand Prix bikes used it, but this looks more cost-down.
I still hanker after a nice 70s tourer, but the one I found here years back was, like you said, absurdly large. There was a bike 'dealer' (in reality, hoarder) in my neighbourhood who had several lovely old Dawes and Claud Butlers, but they'd been badly stored and some of the frame tubes were rusted through.