It's possible it's a:
* Misspelling: There might be a typographical error. Check if you meant a similar-sounding word like "Steingut Seidel" (stoneware stein) or "Stand Seidel" (standing stein).
* Regional Dialect: It could be a word used in a specific region or dialect.
* Made-up Word: The word might be a fabricated term or a play on words.
To get a better understanding, please provide more context. What were you reading or where did you hear the word "Standeseidel"?