Hallo,
I'm looking for a 28" steel frame or frameset. If the former, then 1 1/8" headtube is required. For example, Panasonic CB 5000 is nice as well as Miyata touring rigs from the late 80s.
Seat tube ~ 57cm
Head tube >12cm
Canti pegs are required. A (near-)horizontal top-tube is preferred...