All stainless steel version? Does this refer to already existing black handle version?
I wrote to Muhle direct. My understanding is, all Rocca heads now have a CNC machined 316L stainless steel top cap and CNC machined 316L stainless steel base plate. The top section of Rocca handles (birch bark, jet black and DLC coated versions) are also CNC machined 316L stainless steel, press fitted onto a brass middle section. This may be different for the "all stainless steel" handled version of the Rocca, announced Nov'19.
Updating previous posts and observations by
@Dr Watson; the difference between each version of the Rocca head, appears to be as follows:
V1 = MIM (Metal Injection Molding) top cap and base plate.
V2 = MIM top cap and MIM base plate (MIM circular flow marks polished off the underside of the top cap) blade posts and centre post are glued / welded onto the top cap rather than a complete MIM mold, as V1.
V3 = MIM top cap (complete mold with visible MIM circular flow marks on underside of top cap; no glued / welded centre post or blade posts) with CNC machined 316L stainless steel base plate. Base plate re-designed - now with narrow centre channel.
V4 = CNC machined 316L stainless steel top cap and CNC machined 316L stainless steel base plate. (I am assuming "CNC machined top cap" includes the centre post and blade posts in the machining; but I do wonder if my assumption is correct after the surprise at how V2 heads were manufactured).
I now have a V4 head, but the V4 top cap looks identical to a V2 top cap. I am not sure how you would differentiate between a V2 and V4 Rocca top cap; perhaps someone who works with metals would immediately know. In any event the manufacturing tolerances on my latest V4 Rocca are visibly tighter than my V3 Rocca.
I might now wait for V5 of the Rocca...