Hand hammering our Vanguard bronze neck tube compacts and hardens the metal and brings out specific sound and response characteristics.
 
Sound characteristic:
The Vanguard Hand Hammered Bronze is our brightest neck. The brightness is perfectly balanced out by the rich mid-tone presence. It is the least resistant of the Vanguard necks yet retains the strong core projection of the line. Very powerful and resonant and reminiscent of the best of the mid-period SBA necks.
 
-From kbsax.com