1858
Ritchie, Newcomb & Co. started the Frontier bank; the Producers' Bank (Gov. Barstow) did a small business during 1857–1858 and soon closed.
The evidence
“Carpenter, 1845. Eock Eiver Bank, Frontier Bank, 1858.”
1908-brown-rock-county/00-front-matter-vol-1.md, Vol. 1, PDF p. 14
Brown, William Fiske, editor. Rock County, Wisconsin: A New History of Its Cities, Villages, Towns, Citizens and Varied Interests, from the Earliest Times, Up to Date. Chicago: C. F. Cooper & Co., 1908. 2 vols. archive.org/details/rockcountywiscon01brow, archive.org/details/rockcountywiscon02brow.
Grade A: Found on a page of one of our sources
On the printed page (Vol. 1, PDF p. 14) · open the whole page “Producer s Bank. — During a portion of 1858, Gov. W.”
1879-history-of-rock-county/14-rock-county-ch08-janesville.md, PDF p. 587 / book p. 591
Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.
Grade A: Found on a page of one of our sources
On the printed page (PDF p. 587 / book p. 591) · open the whole page