Lee
There are some 0-serial numbers that contain 6 other digits, Ie, 0386294 (just made this up) would have been a revolver with sn 386294, to which a zero was added, by the factory, as a prefix to the original number. I became aware of this when one of our daughters was living and working in Hong Kong. She met another American lady (whose mother was Spike Jone's daughter) working at the same company, and they became friends. This lady (both were about 23 or so) was/is the grand-daughter of Spike Jones, the wacky bandleader who used to appear on the Ed Sullivan Show. Spike was 'famous' for firing blanks in his K-22's as part of the music. He got the K-22's by driving up to the factory, firing his K-22, and picking up one or more of them. They were 0 guns, with 6 digit serial numbers prefixed by 0, and are listed somewhere in the 0 records. I have a letter for one of them.
Don
The zero records are not just one book, but several documents. I ran into this duplicate issue when lettering one of Congressman Cecil Kings 0-guns. What was in the primary source was a totally different gun. Roy found some other documents that listed these other 0-guns, and in there was the gun I own.
Regards, Mike