yes...great horns, except the last set pictured not so much, it has no real curve if Im loking at it correctly...
the small set with the "U" curl look like a bugger to drill, but well worth the effort, if you happen to love "U"
curved horns as much as I do...they make a simply beautiful screw or southern banded applied tip horn.
And the set bound in red look like they would make up some great horns too.
If they can be had reasonably, I use such hat racks from time to time myself...especially if they are old buffalo horns...but as you say, as an antique. a set in good shape is worth quite a bit as a collectable
so I generally only cut up the sets that are in poor condition.
This is being hotly debated else where on our board, but if done right and carefully, alot of the patina can be saved when you make up horns from such finds as well...I find that always helps a bag I pair them with market better...and most of the shaping and smoothing is already done, especially if you go the screw or aplied tip route...just dont boil fit the end plug or you will biol the patina right off up to the depth of the water you use...I always carefully dry fit and plug ones like this...you can still achieve a close, air tight fit.
T.Albert