Ohio Gunsmiths & Allied Tradesmen Vol. II page 145.
O B Vandenburg (1824-) Findlay
1853 Directory entry as gunsmith
1860 O B Vandenburg ,36,gunsmith, born in New York. wife Emily J . 32, born Ohio. Eldest child Jay b. Ohio, three other children.Resident in Findlay.
1860-66 Gazetter & directory entries as a gunsmith.
1883 Directory entry for Vandenburgh brothers guns and sporting goods. The brother(Gamaliel C. ) was 4 years older than O B. He is listed as a farmer.There is a halfstock .36 cal. percussion rifle with brass lockplate marked O B Vandenburg Findlay Ohio.
Jay his son was a gunsmith and is listed as such in 1860 & 1881.
On page 147 there is a picture of a halfstock percussion target rifle,back action lock, oct barrel/hooded front sight and rear peep, made by O B & on page 148 there is a double barrel percussion,w/rifle sights and round barrels, made by him.
You might try the aolrc.org site.