Rauzan was built as the British fishing trawler Earl Hereford.

Sold to the Faroe Islands in 1912, she was purchased by the French Navy in 1917, serving as the patrol boat Guénon.

The engine was made by C. D. Holmes & Son Ltd., Hull, Yorkshire, United Kingdom.

The fishing boat registration GY 147 and United Kingdom Official Number 123569 were allocated.

[4] In 1917, Earl Hereford was purchased by the French Navy for use as an auxiliary patrol vessel.

[1] The fishing boat registration L 1965 was allocated,[2] as were the Code Letters OQHY.