Hello all here at bass talks, I am fairly new to the bass world . I live in germany and came acrossd a vigier passion series at a second hand store for around 200.dollars. my questoin is how do i find the date of manufacture?? under the bottom strap lock is a clear zone with the numbers 851...i know it is a custom because of the clear blue sunburst paint, but i just cant find the date...can anyone help me??? thanks..