hi,
The Longines-dials were (usually) made by STERN FRERES S.A. and they didn´t silver the feet. One of the feet is visible near the balance (see pics), so you can check, if it´s silvered or coppered. Silvered means mostly "redial".
I don´t know why there is such a high number between the 3xx and 4xx - perhaps a mistake? This small and un-military type is wrong between the others on the list.
Normally watch companies did not produce cases by themselves. I suppose they called a casemaker company (Huguenin f.e.) and said: "Please 200 cases, acier inox, 34mm, hinge-back, etc.".Then they assembled series of watches and stamped the matching numbers on cases and movements.
I hope I get it right; english is not my first language...
rgds - h.u.
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