my half Kong
A side by side, with the full '42RR insert. HA sold this copy way back in 2005, for $5750.00.
Your artwork is slightly different from the insert art, Wim (the title is in a different spot and laid out differently, the plane's locations etc) How wide is your piece? 14 inches? 22? Could yours more likely be a partial WC? (or, if wider, a jumbo WC?) The color on your piece is so vibrant, too. Love it.
(It may even be a partial WC or partial insert from the 1938RR!). The art looks to be very close to that done for the '38 OS.