We think that we have found the Silas Beckwith who was probably the father of Samuel Beckwith.
From an old bible, called the Oldroyd-Beckwith Bible, we find the birthdate of Samuel as 15 feb 1781, Connecticut.
The Oldroyd-Beckwith bible, also gives Samuel's children's birthdates, Samuel's wife's birthdate and deathdate. In addition, it shows a Silas Beckwith born 28 Dec 1752, and died 3 August 1834.(We think in Pine City, Chemung County, NY. It also gives Silas's wife as Anna, born 10 Aug 1752 and died 18 May 1837.