Is this the Series 350?
A handy person from Redwood City CA says:
June 7, 2016
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.
Tom from SWISCO responded:
June 9, 2016