28 day moon cycle in this Finnish masterpiece. More at Doubledad.net
https://www.dropbox.com/scl/fi/utp7ph7dbiq4z4eap49ce/RonkkoIcarusBi-HemisphericMoon.zip?rlkey=hw4a7bzgnun774v3ejms6bj9r&dl=0
CREDIT: RonkkoWatches.fi
