Edward VI, Base penny, York mint, 0.67 gr, 1550-1553 AD, third period. 

Obv: E D G ROSA SINE SPINA, Tudor rose, 'mullet' mintmark. 
Rev: CIVITAS EBORACI, long cross over coat of arms.

S. 2475; N. 1946.

Courtesy of TimeLine Auctions (www.timelineauctions.com), Oct, 2012.