The second digit indicates the configuration of keys and mechanism.
"6" means ring keys, offset G, and no split E.
"1" means covered keys, offset G, and split E. (my choice)
"2" means covered keys, offset G, and no split E.
"7" means ring keys, off-set G, and split E.
"8" means ring keys, in-line G, and no split E
The combination of in-line with split E, seems not to be included, supposedly because it tends to be mechanically unreliable.
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