Those 185's are collectable for some people, maybe because of the unique green color. The machine is NOT lightweight like the Featherweight. I have one, and it sews great. However, it is not one to take to work sessions due to its weight. It is a 3/4 size model, and I believe the innards are almost the same as a Singer 99. They do not zigzag.
I would suggest that you take a look at Ebay to see what the going prices are for the 185 these days. The price is certainly less than a Featherweight.
They are cute machines, and I think most were made in the 1950's -- at least mine was.
Dayle