Ok, So What Is This Thing? - Stratoflex 210

I got this in a package with other machines. Didn't really want it but had to take it as part of the deal. I know what I think it is but would rather keep that to myself so as not to taint to opinion of others.

Couldn't find a single reference on the interwebs.

So, what is this thing?

Pictures aren't the best but it's a little cramped in there at the moment.

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Ok, So What Is This Thing? - Stratoflex 210