Duplo Brick 2 x 2 with Yellow '4' Print

Reference

3437pr0006

BrickLink® #

3437pb066

Duplo Brick 2 x 2 with Yellow '4' Print (part 3437pr0006) is a LEGO element. CollectORbuild's catalog records it in 2 sets, including Birthday Parade and Deluxe Box of Fun.