The images of Plymouth County probate records at FamilySearch.org are an invaluable resource for genealogical researchers, but I have a cautionary note for researchers. The "old series" probate records (1686-1881) exist in two image collections of case files on the site. Those images were apparently filmed at different times, and some images of some documents are found only in one collection.
The reason why the beginning date of this collection is 1633 is that it includes the New Plymouth Colony probate records. The 1686-1881 case files are in image sets with titles of the form "Probate case files 1686-1881 no 10073-10149."
and its images sets have titles of the form "Case no 10057-10122 Hickey, John-Hiller, Moses."
As an example of items missing from one set, in the second collection in image set "Case no 3217-3294, Buck, Eunice P.-Bumpus, Nathan" case file #3273 is represented only by an image which says "Missing Document" at image 789. However, in the first collection in image set "Probate case files 1686-1881 no 3215-3286" case file #3273 is found complete at images 721-728.
Researchers who are looking for images of 1686-1881 case files need to check both collections to insure that they have seen all available images.
Dale H. Cook, Member, NEHGS and MA Society of Mayflower Descendants; Plymouth Co. MA Coordinator for the USGenWeb Project Administrator of http://plymouthcolony.nethttp://plymouthcolony.net