OLD PLIERS

Dehorners? be for small animals though

or

Gelding pliers?

Other than that, I am out of ideas

Cheers Kev

ear marking pliers?

GDay Reggy
They are almost certainly castrating pliers for sheep. Though I haven't seen that kind before, they must be very old. The knife blade on the side is used to cut the top off the purse (scrotum) then the grab used to pull out the testicles. The knife was also used to cut off the tail. They were a big improvement on the previous method of pulling the testicles out with your teeth, mmm mmm. Now days we use a rubber ring over the scrotum for castration and a gas knife that cauterises the tail as it cuts it off.
Cheers Big Nick

Reggy
After having another look at the photo, if the blade is sharp on the inside of the pliers as well as the outside they may have a scissor action to cut the top off the purse, but the blade on the outside would still be needed to cut off the tail.