What Stihl chain is this? HUGE!!?

I recieved a chainsaw chain in the mail through ebay, but it was not the one i bid on. Instead of recieving a small chain, i got a chain just shy of 7 feet long! the guy told me that it was the right chain that i bid on, so i just agreed figuring i could just sell it for some good money. it is a carbide chain, and the links are 1" 1/8th long. if there are any measurements you would like, just tell me cause m doing this for my computer illiterate dad and hes not here. He called Stihl and they had no clue what the thing was, even though it says stihl right on it. any help would be awesome. it weighs 8 lbs!, i am uming that it is for some kind of mechanical harvest, but it must be so old that it is not in their catalogs, but yet it looks brand new. if its any help the outside links say stihl in a pattern, with some saying g4 in the same pattern. all the inside cutting links say 30. this thing is the beastliest chain i have ever seen. thanks for any help