Tank difference question

[Coelacanthic]

Thank you.
6l 300bar & 10l 200bar.
Awaiting their return from the test station 300km down the coast so I can photograph the shoulder markings.

 

[Tanks A Lot]

I do not have the 6L - 300bar drawings, but maybe you can fool them with the 7L drawing.

 

[Coelacanthic]

Thanks
10l 200bar
6l 300bar