These stickers?

[redscampi]

Has anyone seen these stickers on the side of a model kit before? I'm curious as to their function and if they can be redeemed like S&H Green Stamps.

[Mark]

Those might have been part of some "save X number of stamps to redeem for another kit" similar to the MPC "Golden Wheels' printed on box side panels in the Eighties.  The Airfix brand would point to that kit having been sold in Britain, possibly Canada.