select serial_no from stamps,paper_master,np_master where stamps.serial_no!=''  and paper_master.paper_code=stamps.paper_code and paper_master.paper='Watermarked paper'  and np_master.np_code=stamps.np_code and np_master.np='P'  and year(stamps.issue_date)=1980  and year(stamps.issue_date)=Currency   order by serial_no