Black boxes, 1969 to beginning of 1971: the first model was with a small blue parts box and a grey alveole. 1971 to 1972: the second model was with a blue alveole. 1972: the third model was with a yellow parts box. After that meccano has changed the color of the box in blue: The first referencee was 20.E (. is the number of the box); In the first serie of blue boxes, you have still the yellow parts boxes. The next serie was with the code 03020. (. is always the number of the box). In 1985, the last serie was the "Enthusiast".