50 h. Till 2 Kc. Childrenãs help with overprint "we are free! Swastika", this near the value to 50 h. Inverted, applied with glue to Blanko-envelope with cancellation "Liberec 1 / German empire post / eighth of October 1938", upper flap reverse missing (insignificant), issue according to Michel only 5 sets, the inverted is an unique, signed Hübner and Reibg HP as well new certificate with photograph Brunel VP (2014) : "the condition is perfect. Due to the small issue is the set very rare. With inverted overprint is no further exemplar recorded. "