What is the cuff insignia of a Merchant Navy Chief Engineer?

Four Gold Rings, alternated with 'purple' rings.

Ship's masters have four gold rings, and no(navy blue) alternate colour.

Commodore Engineer ; Purple'

Chief Engineer ' Purple '

Electrical Engineers ; Dark Green alternate rings)

Radio Officers ; Light Green alternate rings.

Surgeons ' Red alternate rings

Pursers = 'White alternate rings'.

Fleet commodores wear

one Broad Gold Ring

Masters/ Chief engineers ; four gold rings

Chief Officers(Mates) / Second Engineers/Surgeons ' three gold rings.

1st Officer/senior pursers/Senior Electricians/ Senior Radio Officers. ; two and half gold rings

2nd officers / 3 rd engineers/purser/electrician/radio officers ; 2 gold rings

3rd officer / 4th engineer/asst. purser/asst. electricians ; one gold rings.

Cadets of any department ' NO gold rings, but wear a white flash at the colour.

For all officers, there is then a local diamond or ring interlaced with the main rings.

Volunteer officers, as opoosied to paid officers have the same ring format, but the ring is usually in ;zig zag; form .

Submariners, wear a pair of dolphins on the medal position on the chest .

Fleet air arm officers wear a pair of wings on the sleeve, above the officers rings.

Admirals of the Fleet wear from the cuff, up the arm, four gold rings and a broad gold gold band.

The 'old joke' about then was that they wore, 'gold sleeves and blue rings'.