Here's a pin made from the same image, including a copyright date:
https://www.hakes.com/Auction/ItemDe...-AND-ED-BARROW
And here's an interesting history on the company that made it. Don't know whether they had anything to do with the slide, but maybe you can glean some clues:
https://www.tedhake.com/viewuserdefi...e.aspx?pn=whco