@ Eric: Your probably right, I quess life as a luthier isn't always easy too and somethime you just have to make a living , every job is a job, right.
@ Ken: The seller has send me the photo's of the label and I uploaded them on the flickr page. The label looks kinda suspicous even to an untrained eye like mine
On the original add, the seller did not metion age but this really does not look like a bass made in 1783 LOL. It's also strange that the printed part of the label has the same color als de written date.