Like mike said if its cast steel i would go for it,I couldnt find any info about jet anvils online.Dont pay too much for it if you get serious your gonna want something heavier.
A word of caution on ebay there are some real shady people sellind junk cast iron anvils (the one from HF) for way more than they should,pay attention to the sellers feedback,instructions.One guy claimed someone left a bunch of anvils in the basement of the house he bought......look at the feedback who leaves behind 100 anvils???? Plus they ship direct too.Also if an anvil is painted its a good sign soomeone tried to cover something up.I paid 200 for a decent 100 lb anvil in october cause i was in a hurry, I just got a 155 lb anvil in way better shape and its a big difference.Just be patient I found my big anvil in an antique store,didnt have to pay for shipping.Good luck.