30 Pfg Engineering Congress Constance, 2nd issue, centric cancellation \"Constance 2 09.12.49\", very well perforated, faultless condition, the window envelope on the stamp original stuck respectively correlate letter piece is includes the lot, photo expertize H. G. Schlegel: \"stamp and postmark are genuine. [. ] defects at of the stamp not ascertainable. \" (reference: H. G. Schlegel mentions in the certificate \"slightly foxed\", this is from us but by no stretch of the imagination comprehensible, and E. Is the stamp in entirely perfect quality. We give Obvious an accordingly guarantee for a new expertize! ), Michel 1.900.-