Thanks for the time to look for these.
Despite their unusual nature they are probably more marked than I would enjoy so I'll offer the opportunity to others to purchase these.
Looking for a decent quality handmade touring bike frame in 531/531c/531ST, would consider full bike.
Key sizing is 58c-c seat tube and 57c-c top tube, would need to have canti brakes and clearance for 28+ tyres and mudguards, 700c preferred.