P.S. Olt company was founded in 1904 in Pekin, IL.They made their last call in 2002. They probably still have more game calls on the market than any maker. They have to have the keyhole tonal plug insert as shown earlier. You can find these calls on eBay and in estate sales but you have to know what you are doing. Most of them have to be modified either by sanding the tone board or by changing out the old black reed that came in them for a newer white reed.
Two companies make faithful renditions of the old Olt. They are Black Op's calls and DJ calls.
http://bayoumetoboatracingassociation.com/blackopsduckcalls.htmlhttp://www.djcalls.com/jzcart/showitem.php?id=4339This guy buys old Olts and cuts them down:
http://s1.webstarts.com/KirkMcCullough/index.htmlI started with these calls and went back to them. They have that unique, gruff, dominant hen mallard sound. No call chatters like they do.
I will add I am very fond of the Echo Cocobola Timber and RNT Old Style and RNT Original duck calls.
I could talk to you for two days about the old Olt call and just scratch the surface. They have their following. They are hard to blow----you will think you are going to puke your guts out or pass out until you get the hang of it. You cannot cheat on the air pressure. They are LOUD. You wail on them to get a ducks attention and then quit calling as they come in. If need be you hit them with a quack or some chatter to get them back on course.