1915 English One Penny

It would be easier to tell with pictures.

A british one penny says on it 'ONE PENNY' over a picture of britannia, with the date below.
http://pcbunn.cithep.caltech.edu/jj...15_penny.gif ru http://pcbunn.cithep.caltech.edu/jj...15_penny.gif ld 20130309 ap 4 app 1 c prodegemeta3.org s prodegemeta3 coi 372380 cop main-title euip 80.5.69.156 npp 4 p 0 pp 0 pvaid 752773e8f13b44779051af73f1483f00 ep 4 mid 9 hash 300214F4FD550044F2086FAA2617BD5C" border="0" style='cursor:default' onClick='doimage(this,event)'>

Sometimes, people mistake sovereigns for pennies some how. These are solid gold and in perfect condition get a signifcant premium over melt.
http://click.infospace.com/ClickHandler.ashx?du http://www.goldsovereigns.co.uk/ima...gnrev400.jpg ru http://www.goldsovereigns.co.uk/ima...gnrev400.jpg ld 20130309 ap 3 app 1 c prodegemeta3.org s prodegemeta3 coi 372380 cop main-title euip 80.5.69.156 npp 3 p 0 pp 0 pvaid f208de03864345f6ae9f4565d37075f3 ep 3 mid 9 hash E165A70253614C7326CED4C32BB79D1F" border="0" style='cursor:default' onClick='doimage(this,event)'>

A better solution is acid cleaned - this often turns copper/brass coins into a bright golden colour which many people have (including me) mistaken for gold. The reason you think its different is the monarch is different. The fact that you saw a 67' which was the same is because theres an abundance of 1967 penny coins around.