I think that this is a second generation razor.
The head is the same as the Gen 1, and they changed the handle to a round aluminium with a plastic "Adjustment" twist knob.
The handle, the bottom plate and the middle plate feel light, so I assume Aluminium. The TopCap is plated Zamak or brass and the Twist Knob is plastic.
Its a two piece and again the twist knob is most likely held in by the adjustment indicator. This particular example seems to have seen very little use.
It's "continually" adjustable - so has no notches.
As I indicated on the main Erfa page, the change in generations alternated between a change in handle and then a change in head. It appears that the first change was the handle. (See the fourth picture below)
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