I've never seen this set before, but I'm a happy owner now :] As for GC it stands for Green Case
Original set consist of 6P body with 2 SF123 & P60 (no extra parts like P60 or batts). I've reinforced
my 6P with F23 Beamshaper, LF SR9 bulb and two RCR123.

Full Set (please note I've removed the p60 and batts from 6P to show how those can be stored):

Closed Case:

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