SK Mac

It is a beast. The base is a 18" diameter 1" wall sleeve that is filled with sand. This being an old bottom die would make sense one side appears to have been ground/ machined because it goes through the stamp on the side. If I were to guess the whole thing is about 1k-1.2klbs.

I recently purchased an anvil that I personally had history with. It was the lead blacksmith's anvil at National Spring co. when I worked there 18 years ago. National Spring has since gone out of business but it was open for over 50years. I was wondering if someone may be able to help with identifying the maker, age, weight, and a value? This anvil was used for shaping leaf springs. The bottom stamp is 5-5-1= 841lbs?