6AC7 WARDS Super Airline VACUUM TUBE - GUARANTEED

WARDS Super Airline 6AC7 VACUUM TUBE, In Box. Part of a large cache of tubes - this one comes from the tube carrier of a Montgomery Wards Repair technician. Asked the gentleman I got these from with DNI meant on the box and he said it was a note to not back-fill (DNI = do not inventory). Tubes have not been recently tested, but are nevertheless GUARANTEED against DOA.