Nicely colored fish on the front, a trout we think

Oval, 5" wide x 3-1/2" tall

Bare backing on reverse side

This group was founded in Santa Monica, California in 1965, They are one of the oldest fly fishing clubs in the Los Angeles area and are a not-for-profit organization dedicated to the preservation and improvement of all fishing waters. They promote stream and river protection with self-sustaining fish populations through conservation, environmental activism, catch-and-release ethics, and education.

The age of the patch is unknown.  It doesn't match their current logo, so it may be vintage.

Used, as-is.  In good condition.  Possibly a little discoloration on the reverse side.  See attached pictures.