Thank you. That is an excellent resource. I even found some answers to other questions I had about the family of Anna (Collins) (Putnam) Simonds.
On Col. Benjamin Simonds' birth info, I think that, but itself, it doesn't offer conclusive evidence. It does, however, validate that his father was the Joseph Simonds who was one of the first settlers of Londonderry, NH. Other secondary sources cite that particular Joseph as traveling to Killingly, CT, and children born there to he and his wife Rachel. Therefore, I now believe that Wikipedia's birth date and location is the correct one. I can't account for the gravestone or the birth record from Williamstown, MA, unless maybe Williamstown wanted to claim a local hero as their own.