Hello Don,
it looks like normal reflections of your virtual enviroment. Do you use an "studio" enviroment? Try to use one with different lights or try an outdoor enviroment and add a background. As far as i can see, your "jaggies" are mostly on the edges of your anvil, so i suppose it won't be enough to change only the 3d positioning in the scene...
Regards
Stefan
Are you guys seeing jaggies in your keyshot renders, even when output at 300dpi? Wondering if I need to change my display settings in Alibre or if there are some settings in KeyShot that I have overlooked.
I suggest trying a higher resolution HDRI file for your environment. Check here for free ones:
https://hdrihaven.com/hdris/
For each one, you have the option to download multiple resolutions. Try 4K resolution. Going to 8k+ probably won't improve anything but will increase render time.