Table:
text: Pronunciation of English ⟨th⟩
Germanic origins
Germanic origins
Proto_Germanic West_Germanic Old_English German Dutch
*þ *[þ] [θ] /d/ /d/
*þ *[đ] [ð] /d/ /d/
*đ *d /d/ /t/ /d/
*đ *d /d/ /t/ /d/
*t *t /t/ /s/ or /ts/ /t/

Question: What is Proto-Germanic if Old English /d/ is ⟨th⟩ in English pronunciation?

Question: What is Proto-Germanic if then German is /s/ or /ts/ for the pronunciation of English ⟨th⟩?

Question: What is Dutch if then Old English /d/ is ⟨th⟩ in English pronunciation?

Question: What is West Germanic if German is /s/ or /ts/ from English pronunciation ⟨th⟩?

Question: What is Proto-Germanic if German /t/ is ⟨th⟩ in English pronunciation?