has a heavy spring and hinge arrangement which returns it to the open,
ready to slap, position.
It also has an extra weight added to the
end of the moving part for efficiency.
The "contact" side
is well padded with what appears to be human hair
and is covered by leather
(which is so worn it resembles felt).
DeMoulin catalogue from 1930 lists this item as a "Spanker complete
with 50 blank cartridges" and gives the price as $5, you can see the
catalogue at: http://www.phoenixmasonry.org/masonicmuseum/demoulin/spanker.htm
If anyone has any
more information on this manufacturer or has an interest in slapsticks,
feel free to contact me,
Thanks, Eric firstname.lastname@example.org