Are these from the seventies and / or older - newer?
The Coleman company designation on the powerlets dates them to approximately 1971 - 1990 I think. Looks like 80's to me?
I found this video on the Eley Wasp pellets. The originals are still very sought after today as they have been long out of manufacture according to the web. I would have to guess and date that tin to the 70's? There is lots of nostalgia about them on some old airgunwarriors threads.
https://youtu.be/Fw8XMADL9IA?si=gChgQBxg2HTr_1G (https://youtu.be/Fw8XMADL9IA?si=gChgQBxg2HTr_1G)