Yes, what you have described is perfectly normal. The center of mass will typically always give the greatest rebound. I own an Arm & Hammer myself (a 90 pounder from 1914 made for Belknap Hardware in Louisville KY) and they are my favorite American made anvils. Great find!SilverDeck
Thanks for taking the time to look up the serial number. It is very much appreciated.
As mentioned, rebound is good over the center of the anvil.....a little less so over the horn and rear of the anvil. I assume this is somewhat normal??
And yes, arc welded at the waist.