There are a few possibilities:
* Typo or Misremembering: The episode title or date could be slightly off.
* Episode Name Variation: "Fencing Master" might be a nickname for a different episode.
* Lost or Unaired Episode: It's possible that this episode was filmed but never aired, or it has been lost to time.
To help you find the episode, please consider:
* Checking official episode lists: Websites like IMDb and the "The Abbott and Costello Show" wiki can provide a list of episodes with their air dates.
* Searching online forums: Fans of the show might have discussed this episode on forums or message boards.
* Contacting TV archives: Organizations like the Library of Congress or the Paley Center for Media may have records of lost or unaired episodes.
Please provide more details about the episode if you have them, such as the episode number or a brief description of its plot, and I will do my best to assist you further.