The actual name of “Selby” was “Thomas H. Selby & Co.” At that time,circa 1870, they were primarily importers of metals, with offices at 116-118 California Street, which was right in downtown San Francisco. Their smelting works was in the North Beach Section of Northeast San Francisco. By 1900, the name of the company was “Selby Smelting and Lead Company.” They had a shot tower on the southeast corner of Howard and First Streets, which is also in downtown S.F. In fact, it was about a block and a hlaf from our Gun Shop, although to my knowledge, the tower was gone before I was even born. The Assay and General Office was at 416 Montgomery Street, which was in the area that today is considered the financial district of San Francisco, north of Market Street, which is pretty much the main, downtown street of the city, although in my view, not the most important street by far. In 1900 the smelting works were in Vallejo Junction, in Contra Costa County, which is across the Bay from San Francisco and some distance from it. I honestly don’t know where Vallejo Junction was and have never heard of it in any context other than the Selby Co. The City of Vallejo, in the S.F. Bay Area, is in Solano country, not Contra Costa.
In passing, in the 1870s, Thomas H. Selby was Mayor of San Francisco, an indication of the his standing and that of his company in the city at that time.
There are have been a number of articles in IAA Journals over the years either about or touching on Selby Smelting and Lead Company. The cover of the Journal issue 454, March/April 2007, has a nice picture of a sample box of windown shotshells from Selby. The box indicates that the company had facilities in Seattle, Washington, as well as San Francisco. Check the IAA Index on the website for these articles.
This is just a very small capsule glance of the information in my own files, and I am sure specialists in shotgun ammo have much more than I do on the company.