This is a Cook & Brother Lock Assembly, manufactured in New Orleans in 1861.  It was for a three digit New Orleans Cook serial number 328.  It has the early style First National Confederate Flag behind the hammer & Cook & Brother, NO 1861 and serial number 328 stamped in front of the hammer.  This is a rare little puppy.  I have only encountered two unattached 61 date New Orleans locks in the last 30 years.  This would make an early Cook Rifle with a Tower lock in it very happy!  Price $2,750  Reduced! $2,000  SOLD!!