Closing and Opening. Leitz Elmar-V 65mm.

This is the well-worn key to the padlock securing my late father's British Army issue steel trunk from c.1939.  I use the trunk to store my hand-held power tools and super-accurate measuring tools.  It has a bar that slides first one way and then the other to release the two hasps and the lock requires two full turns of that key to open it.  Closing and opening is the theme.  Happy New Year, folks!