No date on the box that shows original price is $1.29 and was made in Hong Kong - so 1960's is a best guess
24 plastic blocks ( each measure 1 and 3/8th inches square)
2 each of 0-8, 1 each of the number 9 and the 5 math symbols - plus, minus, multiply, divide and equal
The abacus is 8¼ inches long and 2 inches tall