Lewiscircle, thanks for the information and photos of your Mann and for telling the fascinating story of its discovery. I love the fact that this pistol was your grandfather's little "secret" for so many years. It fits perfectly with this curious little pistol's role as a deep concealment/hideaway piece, whether it be on someone's person or in a static location like the hidden drawer.
I really enjoy listening to stories that connect these surviving pistols to the past. Hopefully the willingness of people like you to share your stories and information will encourage others to do the same. It enriches all of us when these inanimate objects are connected to the lives of real people, either living or dead. This connection is the linchpin of my interest in these and other vintage pocket pistols.