I have a pair just like these, but my understanding is that they are not real handcuffs. These "cuffs" were made in different sizes for animals. Two small ones have been joined together to make up what appears to be a handcuff.
How much are they worth? That depends upon how much the buyer wants them. They are very well made and not just a bit of junk. Collectors of old iron work and agricultural equipment may be interested in them even if knowledgeable handcuff collectors are not.
