...but the stock number is almost the same as that for the WW2 general mechanics tool kit...[ ]...the FSN for the GMTK knife was 41-K-370.
This is going to sound picky at first, but bear with me, there is a madness to my method...
'The FSN for an electrician's knife, with a main blade, a screwdriver blade, 3-3/4" OAL, with wooden scales and a bail, was 41-K-370. 41-K-370 is not the FSN for the GMTK knife. The US Army Ordnance Department chose to put a 41-K-370 in every GMTK.'
Slight difference, rewording it like that, but important.
The Federal Standard Stock Catalog was administered by the Treasury Dept. The stock numbers were generic. They were used by any federal agency, including the technical branches of the Army (Corps of Engineers, Ordnance, QMC, etc) and Navy.
As I told you in our email exchange, the Navy Aviation Supply Office applied an "R" to the beginning of the FSN, during the war and after. See Pic 2.
If the Navy brass felt they needed to do that to distinguish aeronautics equipment from other identical equipment with the same FSN (the fingerprints of just how stubborn the services were in fighting standardized supply, by the way!), it stands to reason they felt that way about the equipment their other Bureaus dealt with. My hunch is that there is a big book like this out there for the Supply Office for Yards & Docks, Ships, Personnel, Medicine and Surgery, Ordnance, or Marine Corps, and one of them used the "G" prefix on FSN's.
So that an electrician's knife issue to a mechanic onboard a Navy ship had a different stock number than the same knife issued to a mechanic at a Navy airfield.
Not kidding. That's how parochial it was even within the same "service".
By the way, note that in 1945 they electrician's knife in the Navy ASO supply book was R41-K-455. It sure looks the same as a 41-K-370, and I never figured out what made the -455 different. See Pic 3.