reel mowers

I just got three of them today. they all turn free.
Can any one tell me what there worth

Probably worth the going rate for scrap. It would take a lot of cleaning, de-rusting, and sharpening for them to work good and then you need new tires.
 
 From Mother Earth News article:

You should perform basic maintenance on a reel lawn mower after every third use, and the procedure is perfectly simple. First, put it up on a workbench. If you grovel at its level, it’s easier to be injured by the blades and lose tiny parts in the grass.

If it’s old, the blades probably need to be sharpened, and you need practice to do this right. Moving the wheels forward causes the blade cage to rotate rapidly because of the movement of a series of gears (which might need to be oiled or repacked with grease). Check the rubber wheels. If they’re slick and can’t get traction, the reel won’t turn efficiently. You can temporarily repair this by making grooves in the tires with a three-corner file — until you have time to look for replacement wheels.

Always wear leather gloves when working with the blades for any reason, including debris removal when mowing. To hone the blades, jam a wooden stick through the cage to prevent it from turning. A coarse sharpening stone and a light application of cutting oil will make each blade sharp within seven or eight light (but even and smooth) strokes. Follow the angle of the blade as closely as possible.

Use the same number of strokes on every blade to ensure a uniform distance of all blades from the cutting bar, which should almost touch the whirling blades, leaving room for the width of a blade of grass. You may need to adjust the cutting bar when you’re done. If your blades slice easily through a sheet of newspaper placed on the cutting bar, you’ve done it right.

Some experts advise dabbing the honed blades with grinding paste and pulling the mower backward for 10 minutes. But I tried out this method, and can tell you that death-by-boredom may occur in half that time. A young person, if desperate enough, might do it for $20, if nobody sees them. (Those were exactly my nephew’s terms.)

On most models, the gears in the wheel assembly aren’t hard to access, but you must be careful not to lose any nuts, bolts or pins. (Drop them in a small can or jar for collection and oiling.) Remove the wheel covers and pack the exposed gears with light grease. If you’re lucky, the wheel covers on your model will have lubrication holes. After each mowing, use a garden hose or air compressor to clean the blades and wheels. Then spray everything liberally with WD-40.

Always mow on a dry, clear day — weekly is best.

c tucker is right,             the best thing to do is go to a golf coarse or a dealer for golf coarse equipment with the reels and brgs and the bed knives and have them sharpened also brgs need to be in execlant condition or the reels will hit the bed knives when adjusted proper or will not cut.         the  golf coarses have machines that spin the reals like a lathe  with a grinding wheel that moves back and forth  also about the same for the bed knives that makes very thing the same .      ( we have worked on alot of golf coarse equipment over the years and we send all the reels  and hits hard to get it done unless its winter time     

I am willing to sell these three mowers. If any one is interested in them . Pm me for more information.