I recall reading somewhere, it may have been in an old Thread on this forum, that the Pyro-oxidized finish on Tobin guns was a version of the Carbonia Blue used by Colt, S&W, and other companies.

It was known for its' durability, better than hot salts bluing, and was developed by the American Gas Furnace Co.

https://winchestercollector.org/forum/winchester-rifles/carbonia-bluing/


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