The Alco would likely have been offered in a single-speed version in addition to the three-speed. I have no idea whether the one I posted is complete, as the owner was deceased when I got it. For example, the Schwinn tri-wheeler Town and Country would have chrome fenders on all three wheels, whereas the Alco has only the front.

Edit: Here are some photos of an Alco 3 restoration on this website: http://www.resurrectionbicycle.zooms...tion%20Project .

This copy of an Alco ad found on another site seems to show no fenders on the rear wheels: http://www.proteanpaper.com/scart_pi...00000000006945 .