Good looking grunt call. The sound out of an all wood call is amazing, you will never hunt with a plastic tube version again after you hear a wood one.
Back before commercial reeds were readily available the only way to make a grunt call was to make your own reed and you had no choice but to use wood to make your exhaust barrel. I did experiment with the some plastic tubing from the hardware store in the 80s or maybe earlier. Then came out the reed assemblies and all I did was the plastic tubes until a couple of years ago. Some where at home I have one of my old calls, when I return home if I remember I will post a photo of it. That one is sort of modeled after a Herters or Gander Mountain deer call.
Marvin