Hi up for consideration is a EL3 Miniwatt tube.
A visual check seems to indicate everything looks good however I don't have a socket or adapter to test this one.
filament shows resistance and flashing is in good condition and base is firm , no burns on the top .
no resistance between g1 , g2 , g3 , anode or cathode . plate is Mesh .
at a glance it would appear to have had little time in the socket .
thanks for looking.