2000 M. (7) and 500 M. (3) numeral front- and reverse on complete package card from Heligoland 26. 5. 23 with handwritten notation "transit" on package slip of paper to Switzerland with all postmarks and note, Heligoland was customs enclave, all package shipments must over the custom offices liquidated become, Germany was in that case only transit country, very unusually and rarely use from this period!