Logbooks (F414) were revised in ‘98 & 2000, main changes being to recording of sim hours. I think the last change was the most recent although sim hours are now recorded in the main section 5 rather than at the back I believe although that took effect after I left.
Try contacting your old unit, I believe logbooks remain Crown property so it could be argued that you’re entitled to a replacement but then they might also ask for it back!