Royal navy insigna ?

[BRAZZA]

Hello . I could not find what is this clothe insigna . Maybe Royal Navy ? WW2 ?
Dimensions 7,5 x 9 cm. Found in a Small Pack dated 43.

Thanks for your opinions

Christophe

IMGA0636 (2).jpg

IMGA0637.jpg

[Jim Maclean]

OS Quarters rating, gunnery branch.

[BRAZZA]

Many thanks Jim !