I'm a novice. Opinions please ? Is this authentic, tough to find, common, rare, etc,... ??????????????http://cgi.ebay.com/1930-Zeenut-PCL-HARRY-ROSENBERG-Sacramento-JEWISH_W0QQitemZ5240284662QQcategoryZ1222QQssPageN ameZWDVWQQrdZ1QQcmdZViewItemThanks very much !!!Alan