Worksman makes a straight-top-bar frame and a curved-top-bar frame. You may have one of each. If they don't look especially old, they probably are either Worksman or some other brand of industrial bicycle. If they are industrial bikes, they were likely painted yellow to begin with, so see if any hint of yellow is visible inside the seat tube or bottom bracket.
On the black one, the curve of the lower tube doesn't match my newish Worksman. Also, my newish Worksman doesn't have rack or fender lugs- the little loops back there. The fenders bolt around the axle. But this could very well have changed over the years.
On the current Worksman website (
http://www.worksmancycles.com), they have a Discussion Board. You might try asking there, or emailing Worksman directly to ask if they can confirm these are Worksman. If so, they may be able to give you an approximate year.
Check the bottom of the bottom bracket for a serial number.
I recently bought a Schwinn Heavy Duty bike down in Houston for $60, complete with basket. And I understand quite a few similar bikes are floating around down there if people are interested- so if they are newer, they're not necessarily that rare or valuable.
Some other brands of industrial bikes:
Husky, Summit Workhorse, Torker, Atlas/Sun, Greenline, Mohawk, Emory, Schwinn. The Emory looks the most like the Worksman of the lot.
