Krave Antiques has dated this piece to the 19th Century.
The epaulettes which have gold and silver thread, attached silver naval anchors and brass crown buttons are by Naval Outfitters Matthews & Co of Portsea and Portsmouth.

Hat inside circumference = 56 cm / 22".
Approx measurements of case:
W = 46 cm / 18".
D = 19 cm / 7 1/2".
H = 27 cm / 10 1/2".
Weight: 1.878 Kg.
Condition: Very good used antique condition with age related wear. Hat has some moth holes to inner headband. Tin case has all over rust and dents. Please see pictures.
Krave Antiques has dated this piece to the 19th Century.
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