used Complete plate reconstructions of 1a and 1b, neatly mounted on leaves, each page showing a complete row from both plates mounted alongside each other for comparison, full annotated listing re-entries, double letters, constant varieties, etc., the vast majority being with four margins and either neatly or lightly cancelled, included are a good number of very attractive examples, the condition generally well above average or good to fine. A superb study very rarely offered before in this way