Hello. I have researched as best I could. I cannot understand how the weight is determined on these anvils. Could someone explain exactly. My impression is this anvil is 1830-1850s?

Any help is appreciated. 

If the Pritchel hole is original and not drilled later it was made after 1830. The weight is Imperial Hundred Weight. First number is multiples of 112#, second number is multiples of 28# and the third number is the remainder in lbs. 1- = 112lbs plus zero for the second number plus 12lbs for the third = 124lbs. She's a beauty! how's the rebound?

Well I only brought my 5 lb hammer to test. But it bounced very well overall. I tested multiple places. I am ready to get it strapped down and start hammering. I think I made a fair offer on it. It wasn't for sale..I asked.

 

The hole, best I can see, isn't not drilled.

Mousehole Forge used that stamp up until 1835, so (like mine) yours is probably from between 1830 and 1835. It will serve you well.

Thank you.

Any time. Knowledge is not diminished by being shared.

You determine the weight by weighing them.  The weight stamping is probably only "close".  

English anvils used the CWT system until fairly lately, now Kg I believe.

Swedish may have pounds or Kg, (pounds for export to the USA anvils)

American anvils will have weight in pounds.

Very nice anvil!  Not too much sway on the face either.  I've seen some MH's with quite a bit of sway in them. 

That's why I asked to purchase. It's really level. It certainly is in great shape for the age. I run across a few doing my job.