select issue_date from stamps,paper_master,printsize_master,np_master where stamps.issue_date!=''  and paper_master.paper_code=stamps.paper_code and paper_master.paper='Unwatermarked Gummed coated stamp paper' and np_master.np_code=stamps.np_code and np_master.np='P'  and printsize_master.printsize_code=stamps.printsize_code and printsize_master.printsize='3.55 X 2.5'   and issue_date!='' order by issue_date