Authentic sterling service recognition member award emblem applied on a white metal band (appears like a sturdy aluminum alloy). This likely was used by the recipient instead of as a pin or necklace. .

Came from the West coast via a long-time collector of aviation, sporting and military memorabilia, 

Historically, wealthy California aviation executives, aerospace engineers, and pilots heavily crossed over into private outdoor sporting clubs.  A premier example of this is the Greenbriar Hunting Club. Clubs like this were notorious for being exclusive retreats where airline magnates and military aviation veterans gathered. L.G. Balfour was a renouned company which regularly designed watch fobs, pendant awards, and medallion necklaces for these retreats to celebrate successful migratory hunting seasons or club milestones..