Unlike the 1933 Jamboree, these stamps were issued 4 months before the event, not 3 weeks.   This allowed the stamps to function as free advertising as they were heavily used commercially, to destinations throughout the world.  Presented is a registered FDC from 'sGravenhage to Lucerne, Switzerland and a cacheted FDC from Enkhuizen with a round hand cancel "1.IV./1937".  In the cachet on the Scout Emblem; "WAAKT" (Be prepared).