(Laser cut plastic, 4.75" x 4.75" x 1/4";
base is 1/8" thick, tray edge is 1/8", thick and pieces are 1/8" thick)
Looks like the
Fifteen,
puzzle at first,
until you notice that pieces,
except for piece 15, are joined together in pairs.
Described on page 151 of
Hordern's book,
who notes that are a number of ways to solve it.
The designer has made the pieces sufficiently tight so that solution is
possible but not via Figure 4 shown in the Dustin patent: