Most visitors online was 1990 , on 7 Feb 2022
If the clock has tole (not toll) painting, which was done by an owner, then it would seem not to be original, if by original you mean the painting was done by the manufacturer.I’ve seen multiple Gilbert’s with toll painting so I believe it may be original.
One of the images claims an 1807 production date, seems hard to believe. I'll post a picture of the movement soon.