Koehler & Ritter was founded by Gotthard Koehler and Charles A. Ritter in the year 1867 in San Francisco, CA. Both its founders were former employees of Frederick R. Reichel (Around 1856-1867), another silversmith in San Francisco, CA. Koehler & Ritter manufactures both sterling silver flatware and hollow ware. 

Example of TKoehler & Ritter Silver Mark

Alameda / Ivy

Berkeley / Alhambra

Gothic (First Introduced in 1862)

Also Vanderslice and Schulz & Fischer Eureka pattern.

Medallion I (Multi motif)

Yerba Buena / Janin (First Introduced in 1865)

Also Vanderslice

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