In terms of finding photos of examples, it depends on the thing I am looking for. In many cases, I will search the internet as certain websites serve as useful archives. For other things (e.g. unusual examples), I do have various folders with photos that I have saved.
Good observation, regarding the "s" in Longines! I would guess that it was a batch with flawed printing.
P.S. Have you measured the diameter of this dial? Also, did it come with a movement?
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