Am 14.03.2021 um 14:36 schrieb RJH:
[TRV]
...


https://www.icloud.com/sharedalbum/#B0z5idkMwmb0Bb

For the 'comb':

https://en.wikipedia.org/wiki/Keymark

Ah, thanks. Looking at the other one more closely, it's not 2 people about to
hug in a pre-Covid sort of way?!

Dunno. Never seen that symbol.

BTW: The stamps look very similar to the ones on this valve:
https://www.pegleryorkshire.co.uk/EN...le_Pattern_TRV

Zoom in!