Yes, the mark is an oak leaf and acorn.
Vincenz Carl Dub was born in 1852, he took over the business of his father, Thomas Dub (b.22-12-1811-d.19-3-1889), that was founded in 1838, in 1889 following the death of his father. Vincenz Carl Dub's daughter married Alexander Sturm (b.6-5-1851-d.28-9-1915). Vincenz Carl Dub died on the 15th March 1922.
V.C. Dub - Wien - 1898