Thanks Trick, you're giving me a chance to use my Christmas present, the book Anvils In America by Richard Postman. Your anvil ws made by the Illinois Iron&Bolt comapny from 1875 to 1969. It is a steel faced cast iron anvil. The last digit is always left off of the weight of vulcans so yours is a 100lbs.
Richard writes;"I would not rate the Vulcan anvil as being of the same quailty as the Fischer&Norris Eagle or the wrought anvils, and slightly higher quality than the strictly cast-iron anvils."
I checked out a 100 lb Vulcan recently and checked it against a 96lb Mouse Hole anvil for ring and rebound. It didn't give quite as much rebound or ring as the Mouse Hole, but is much better than you'll get out of the cheap chinese stuff you see on ebay and flea markets.
I would say it will serve you fine until you can get something bigger and better. I would keep it though, as a small anvil like that will be handy if you ever want to go mobile. I got the mouse hole cause I do some demonstrations and its a lot easier to get in and out of the trunk than the bigger ones.
Hope this helps.
Ed