James I (1603-25) silver Thistle Penny. 
S-2661. N-2106. 

ROSA SINE SPINA (rose without thorns) issue
legend (translated as "May God Guard These United" kingdoms) within two beaded circles in the center of which is a Scottish thistle

Seaby 2661

Courtesy Ira & Larry Goldberg Auctioneers, Beverly Hills, CA. www.goldbergcoins.com
Sale 31: The Pre-Long Beach Auction May 30 - June 1, 2005, Lot 2150