GE 20w T12 blacklight blue tubes

I received a nice surprise this morning upon lifting the lid of a local lamp bin and finding these 3 GE blacklights, which appear to be NOS. These are not as old as the other example I have due to the presence of CE and HG marks, but at least they were still made in the USA. Clearly they weren't designed for export as lamps are not required to carry the Hg symbol here in the UK.