Ah yes, one that couldn't be sold with the 'regular' batch, but is still just as cool. Pop a repro German M31 chinstrap in it (yes, they actually did that IRL) and you've got a very nice example of a WW2 M39 that was re-painted on the exterior during the Cold War, but retains the original Dutch paint on the inside, and WW2 Dutch made liner under German occupation, making this one of the more uncommon examples.
Actual helmet pictured.