Is this the Series 350?

A handy person from Redwood City CA says:
I sent the picture of the shoe attachment, top attachment as well as the markings on the unit. I think it is a series 350. It is 28 inches long. I would like to buy several of this configuration. We are in Redwoodshores , Redwood City CA.
User submitted photos of a window balance.
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Tom from SWISCO responded:
This could be the Series 350, but I can't tell for sure. I do not see your top attachment. If it matches our 19-002, though, then the Series 350 is a good bet.
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