FYI: These tubes are measured in autobias mode according the manufacturer data sheet.
More information you find at the end of this describtion

1 x purchase = 

2 x unused tubes E88CC 6922 = E88CC/01 Mullard production
selected close matched pairs
Disc getter tubes
All tubes "7L1" acid  coded
Labelled and sold with brand name AEG (AEG was the owner of TELEFUNKEN)

All of them emission = Gm 12,800 .....13,800 (corresponds 100% = 12,500)

Produced by MIitcham UK plant What does this test result mean? Very high emission and a symmetrical and balanced tubes.

Measuring device used: RoeTestV11.
Measurement mode: Autobias as specified by the manufacturer.
In autobias mode the tube is measured with a constant anode current. This corresponds to the application in the device.
Note: Most tubes offered on ebay are tested with a fixed grid bias voltage. Such a measurement contains a general system error. The desired result in the application is therefore purely random.