Unknown toy number, maybe Holgate #352.
Came with more blocks than it would have, originally:
4 pillars (2 green, 2 yellow)
1 column (yellow)
3 diagonals (2 red, 1blue)
1 half circle (yellow)
1 ? arch (green)
2 doublongs (orange)
10 oblongs (3 blue, 2 orange, 2 red, 1 green, 1 yellow, 1 purple)
11 squares (3 red, 2 green, 2 yellow, 2 orange, 1 blue, 1 purple)
Bought with Holgate #398 Junior Block Assortment: 4 Curves, Colored.
Possibly a predecessor to #313/314, an 18-block wagon in 1937, which appears to have the same dimensions.