There were two versions of the MkI....the WH-100 (without arca plate) and the WH-101 (updated to include arca plate QR). The MkII is actually the WH-200. The WH-200 was a re-engineered WH-101 using lighter materials and improved ergonomics for adjustment.
This link shows the WH-101 ...the earlier WH-100 looked pretty much the same except for the lens mount area.
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