Duplo vintage primary bricks

Lego Duplo vintage bricks in classic colors: red, yellow, green, blue. Set of 60 total with 15 of each color: 10 2x2 small bricks and five 4x2 larger bricks. Great for building and play as well as learning activities for beginning math concepts. All of these are from the era when Duplo bricks were stamped with Duplo in the top studs, roughly the 1980s through 2000. GUC; no damaged pieces, but some light surface scratching and evidence of play, and some discoloration/fading especially on blue and yellow pieces.  ** I have a lot of Duplo sets available, and more that aren't yet listed. Willing to split or make custom listings if you're interested in a particular color or style. **