▁after ▁each ▁process ▁in ▁order ▁to ▁train ▁the ▁material ▁to ▁be ▁' round '. ▁Each ▁collection ▁was ▁limited ▁to ▁ 5 0 0 ▁p cs ▁based ▁on ▁material ▁and ▁colour . ▁ ▁Each ▁pen ▁code ▁and ▁number ▁las er ▁eng ra ved ▁on ▁to ▁each ▁bar rel . ▁ ▁The ▁company ▁then ▁introduced ▁designs ▁( Ch urch ill ▁series , ▁ 5 8 , ▁D ink ie ) ▁in ▁ac ry lic , ▁solid ▁silver , ▁and ▁solid ▁gold . ▁The ▁first ▁solid ▁gold ▁pens ▁were ▁made ▁for ▁Her ▁Majesty ▁Queen ▁Elizabeth ▁and ▁H R H ▁Prince ▁Philip ▁on ▁the ▁celebr ation ▁of ▁their ▁golden ▁wed ding ▁anni versary ▁ 2 0 ▁November ▁ 1 9 9 7 . ▁ ▁Two ▁pieces ▁were ▁made ▁in ▁ 1 8 ct ▁solid ▁gold . ▁The ▁queen ▁wrote ▁a ▁letter ▁of ▁thanks ▁for ▁the ▁gift ▁stating ▁they ▁were ▁' use ful ▁to ▁boot '. ▁The ▁pens ▁were ▁originally ▁made ▁in ▁Hor ra bridge ▁and ▁the ▁company ▁moved ▁to ▁its ▁P ly mouth ▁prem ises ▁in ▁ 2 0 0 1 ▁having ▁out g rown ▁the ▁original ▁prem ises . ▁The ▁company ▁continued ▁to ▁produce ▁pens ▁for ▁the ▁Prime ▁Minister s ▁Office , ▁supp lying ▁birth day ▁presents ▁of ▁a ▁Con way ▁Stewart ▁Church ill ▁to ▁ ▁Bill ▁Cl inton , ▁George ▁Bush , ▁Jacques ▁Chi rac , ▁Vladimir ▁Put in ▁to ▁name ▁but ▁a ▁few . ▁▁ ▁The ▁pens ▁were ▁also ▁selected ▁by ▁the ▁Foreign ▁Office ▁as ▁g ifts ▁to ▁all ▁world ▁leaders ▁at ▁the ▁G