Before Model 5 ist Model...6? – Progress (Janalif) typewriter

According to research by Alex Sandler the Soviet Progress 5 typewriter was not introduced in 1940  but in 1942. The previous model he guessed could have been Model 4.
Now I have found this photography from Межреспубликанский журнал No. 26 from 1940:

The banner is saying: The first experimental model of the typewriter Progress M-6. The machine itself looks like a Janalif Model B (1932–40):

The typewriter on the right is a Janalif Model A produced 1929–32:


What is strange is the name M-6. Somebody knows more?

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It reminds of Indian Godrej where the first model was M-9 and its successor M-8. Click here for Godrej.

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