I've altered a few flea mkt Horne's from the 1970's , especially if they were flat plug horns. I have a lifetime supply of half inch thick curly maple slabs salvaged from Fred's wood stove firewood . Those flat pine plug flea mkt. horns can be altered positively by epoxieing a hunk of high grade curly maple on the existing flat plug , then jazzing the new plug up with some art work , or just enjoy the stain enhanced curly. Back in the late 1980's , was traveling around the northern end of Lake Champlain , and stopped at an antique shop there. In the rafters , I saw an original 14 inch powder horn , and rescued it from the dirt. It was white , perhaps too white , and the white was lightly coated with tar , or a creosote substance. I could understand why it was darkened , because if carried in a dark woods , the white could have been seen for quite a distance away. So , all I did to it , was replace the missing plug , and replace the rusted off iron nails. It's been a while , but I think I replaced the original missing plug w/a pine one like many old ones had. Fun like this can't be purchased at any price.