Adding a Year to an existing entry in the Catalog for ¼ Stüber - Maximilian Friedrich - Cologne KM# 161

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I believe the existing entry for ¼ Stüber - Maximilian Friedrich - Cologne KM# 161 is missing a year/ Mint Official Initial combination. Attached are pictures of my coin showing the year (1767) with only the initials of mint official Jacob Kohlhass (IK). It does not include the initials of mint official Elias Gervais (EG).



In the Standard Catalog of German Coins for this entry there is a 1767 IK entry.



How do we include the year and mint official Initial entry into the catalog?

Thanks for the help.
"There is nothing more deceptive than an obvious fact"
    -  Sherlock Holmes      (Sir Arthur Conan Doyle)

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