[SS427]

Ahhh, that explains it as it seemed like a 68-72 style but I have never had one to compare to. I was under the impression that the 68-72 was unchanged. I bought both the NOS early and late boots but they were in the same bag. I knew what the 3975356 was and readily identifiable but was unsure of the 3931688 and all I found on the net was a picture of the 3975356. As far as I know the 3931688 is NOT reproduced. Thanks guys!