Hi Tony again,
I have now looked at my third copy of this atlas, which is named Atlas of The Heavens and not Atlas Coeli. It is published by Sky Publishing in 1969. All the charts in it are in negative form. This I think is field edition and not rare. The earler copies of the Atlas I have are, one that is entitled Atlas of The Heavens and was published in 1949 by Sky Publishing containing maps on individual sheets sized 24×18 inches. The other I have is one entitled Atlas Coeli published by Czech Academy( in 4 languages Czech, Russian, English and German) in 1962 it contains bound maps in sheets 21×15 inches. All are for Epoch 1950.0. Looking at your picture of the Atlas you have it looks a modern edition with a folding bound maps. This is probably the desk edition.This and the negative maps were probably able to be purchased together. So I think you have a modern set of maps and no hens teeth are present! Still a great set of star maps though. If you need any pics of the various copies I have let me know.
Denis