Hello athel_cb, thanks for the reply, and fascinating info from your father. If only we all had such notes.
The Cawsand connection is interesting because there appears to be some Bawden/Bowden traffic between Callington and the Rame peninsula (including Antony, Maker and St John), although I can’t always find records for those involved - I couldn’t find a marriage for William Bowden and Susanna Mabin, for example.
I did spot Ambrose Bowden marrying 1769 Rame to Joan Booth and having two children (John and Richard) before Joan died in 1777, and Ambrose then remarried Elizabeth Booth 1778 Rame and had ten children, including William bp 1794 Rame. Is this your line? It looks as though Ambrose was buried 1822 in Rame, residence Portsmouth, age 72 years, so born around 1750. This might tie in with Ambrose bp 1750 Tywardreath to Ambrose and Beatrice.
As you say the Bowden name is quite widespread in Cornwall and Devon, and not sure if/how the Ambroses tie in with William of Callington, but every bit of info helps.
Thanks again for the interesting reply,
Flemming.