Although this card set isn't particularly old or obscure, it isn't well recorded in published price guides for some reason. Since this was produced by Leaf, was it a Canada-only issue? Or perhaps British? In any case, it features vivid artwork illustrating a fascinating subject, and its relatively low price (possibly due to its obscurity) should attract a wider following.
The card fronts feature a piece of color artwork, surrounded by a white border, with no caption or card number. The card backs offer the series title, followed by 'A series of 50,' followed by the card number, title, and a block of text. A Leaf logo (of a boy blowing a bubble) is at the bottom, with no other copyright information.