Brass-capped Cryselco 65w tubes

Lamp bin finds from yesterday - and the first working brass-capped tubes I have found so far! (Excluding a little 8w Philips I found some months ago). These tubes were manufactured by Philips in Hamilton, Scotland. I imagine for them to have survived this long they were probably in a dusty twin fitting in some boiler or equipment room, only getting switched on once a year.