Michel #7d, 8a-8F mint and used examples. 3 stamps upside down with small faults. A Heligoland collection from the late Luis Martin, a leading expert in these often hard to identify issues. 2006 Michel catalogue value 904. Members of CSDA Director for. The item “Weeda Heligoland Michel #7d, 8a-8F Mint & used, ex. Luis Martin, CV 904″ is in sale since Tuesday, February 7, 2017. This item is in the category “Stamps\British Colonies & Territories\Heligoland”. The seller is “weedastamps” and is located in Victoria, British Columbia. This item can be shipped worldwide.