The Lombard DOHC 2896 cc. straight eight of 1927-1929 had a Desmodromic valve gear by Vareille. Probably a Group 8A system from our classification. We have to do more research on this, because others proved not to be able to debug this matter.
Source : H. Hütten : “Schnelle Motoren”, p. 103
Georgano : The complete encyclopedia of motorcars
D. Wise : The ill. encyclopedia of automobiles
The Logo is not from Lombard [not (yet) available], but from Bollack Netter & Cie. = B.N.C. , which already in the early stage took over production for Lombard.
Source pictures: Patented Systems