Not a "maybe" post — sharing a confirmed VdB (Negronne) for reference.
8th year Violette de Bordeaux. Bought from a reputable nursery, no label swaps, same fruit every year.
Claimed: Violette de Bordeaux (a.k.a. Negronne)
Source: reputable nursery, planted ~2018, 40L container
Growing condition: container, Kanto region, overwinter in unheated garage
Fruit: small–medium, teardrop, very dark purple-black skin
Cross-section: deep red flesh, small eye, tight interior
Brix: 24-28, classic berry-jam flavor
Cross-section, leaf shape, compact fruit size, and fruiting pattern all match what's in the literature for VdB. Thought it might be useful as a reference.
Threads like this with solid references are pure gold. We really need more of 'em — having confidence backed up by actual documentation, that's what makes the whole thing work.