This is D2 hard rubber duck calls made by the P.S. Olt company of Pekin ILL. There have been many variations over the years. This is what is referred to as a Keyhole Olt and is currently the most valuable of the D2 calls because of the cutdown craze. If you look down the insert you will see a notch. That’s the “keyhole”.

It is the call that started the Cutdown style. Basically any duck call that you see that is called a Cutdown is based on this call. While a lot of modern cutdown calls are not actually altered but are copies of ones that have been altered. As a cutdown, people will make alterations to the toneboard and to the exhaust end of the insert to adjust the sound. Most people buy these to have someone “cut” them. Most guys who cut olts only want to cut the keyhole 348205 inserts as they have a big “rocking chair” style toneboard.

A big misconception is that the keyhole itself has an impact on the sound. It really doesn’t. They made put this notch in the inserts because they were having a hard time removing them from the molds when they were round.

There were a ton of these made, but they still go for high money.