I dont have my SCD big book right now, but Its listed under 1950-60's PM10 and look for the one thats described as "white background, batting waist up, with name from elbow to armpit"
Its one of about 6-8 Mantle pins listed in that set/group.
There was one on eBay too, just saw it Sunday.
edited to add a link to the one on eBay
http://cgi.ebay.com/ws/eBayISAPI.dll...m=350358073717