There are always a couple of exceptions, but for the most part our friend lambertiana is correct. The Northfield and Tidioute brands are 1095 and the Great Eastern brand is 440C. The exceptions will be in some of the SFO's; as I have seen some stainless models (mainly on eBay) that were commissioned in 420C to save a little money. But thus far I believe the rule of thumb is that the 440C will be marked with a "Cyclops Steel Works" reverse tang, whereas the 420C will not.
BTW, the serial numbers will be on the bolsters; and the pattern number will be on the tang. But neither one has any qualifier for the steel type used, and are only variants of the patterns and number of blades.
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