This massive set of stickers was produced in France/Belgium, and is (I believe) the first ever set of numbered trading stickers dedicated exclusively to Spider-Man. The year of production is not printed on the packets nor the box. Late 70's is generally accepted.
Five stickers per pack, 300 numbered stickers. Each rectangular sticker is 2¼" x 1½" although within that sticker is an oval-shaped sticker die-cut sticker which is intended to be removed (leaving an outer frame). The back of the sticker is blank card with literally only the number stamped on it.
Notice the words "Heidi", or "Goldorak" on the back of the packet. These are the names of two other popular TV cartoon shows (both Japanese anime) promoted in Europe by Prodifu during that era.
One hundred packets in a box. A sticker album was also produced.