I have a feeling members of this board will be discovering jewels like this for a while
Me too. And I believe the best way to do is by working "in the field", visit the places, talk with the people, try to establish connections with other enthusiasts.
I am also sure there are great surprises waiting for us in places that aren't usually covered, outside Western Europe and North America. For example, tracking the L 3 italian tankettes, I realize there are more in Brasil than the ones I can find pictures on the web.
BTW This trip to Thun lead to more discoveries
Massimo