What are the differences between Luke I,II & III? Finish clarification also needed

What are the differences between Luke I,II & III? Finish clarification also needed

What are the differences between Luke I,II & III? Is the Luke II now discontinued?
I have just acquired a Luke II with matching headstock finish.Would this have been a special order?
Or did they introduce the M/H at some point during its production?
Any ideas on what actual factory finish this is.I would say its more blue than grey/silver in normal light.See 2nd photos.

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