1900 - 1981, (approximate. ), extensive doublets stock in 5 stock books, as well a few better Pro Juventute issues, from approximate 1965 are the issues mainly mint never hinged 2 to 3 time is existing, often with corner pieces respectively sheet margin stamps with animal names, further souvenir sheet 2, 4, 5, 6, 8, 9, 10, 12, 13, 15, and so on, partly double, in total high catalog value respectively post price. (former starting price 500)