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6922EH tube. How to tell type 2 from type 3

Hello all,
How do you tell a electro harmonix 6922 EH type 2 from a type 3 Tube ? I do not have the boxes. They are the new tubes from Russia. Mine have a ring getter supported on two sides by rather thick posts. Under made in Russia is 13 04. The date stamp I assume ?
And what are the tone differences of the two types ?
Thanks for any help.