Supposedily it started as a motivational token of the Rainco Bread company. From one seller:
Up for your consideration the Vintage Rainbo Bread Token shown i n the ( -) photos . NOTE: If the word RAINBO was ever on this coin, it has worn off, but this item was purchased at the estate of a former Rainbo bread representative and if you look close at the photos, you will racognize the logo on the coin
Here's another version:
Status changed to Solved(HistoryHolder, 3 Mart 2025, 17:29)