Vintage tube,Blackburn Mullard from mid 50s (early type)
Sguare getter,bottom code : K21 B4H
Tested on Roetest V10.1 with excellent results (26mA/23mA)
No shorts,no gas
box is not in best condition(see picture)
I will pack the tubes properly(in a wooden box), and will
take great care in doing so
PRICE IS FOR 1 TUBE