Don't think it has a 6 number. The 681 is a post war and what you are looking for should be in Greenburg's Repair and Operating Manual. If you cant find the manual send me an email and I will copy the information out of mine.
I assume you are asking for a post war instruction sheet for the 681 s-2 turbine, I don't have one, perhaps someone has one and would be willing to scan if for you. If not, trainpaper.com has some listed. I bought their disk on postwar display layouts. The instruction sheet may be in one of Bob's other disks. you could ask him. They seem reasonably priced.
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