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Not sure if it even was a collaboration truth be told but I do remember it was a promotional offer posted on here that if you bought a bottle of singletrack flowy ale from the brewery that you got a nice shiny stem cap in your preferred colour with it.
This was circa 2016 if memory serves me right, I'm using a different account since then as I've lost all trace of my old one upon my return but anyway, here's mine and wonder if anyone else is still has theirs?

Who were you before?
I missed out on that thing. Well cool though. I've got a ddraig goch (red dragon) from Tomos Watkins brewery on my stem at the moment.