All information I've found on the Mk6 and 6A has come from one Beaufort brochure on life jackets.
Mk6 complete Stores Ref Section No: 22C/2106
Mk6A complete Stores Ref Section No: 22C/2108
The Mk6 and Mk6A both were issued with a 3-pieceSARBE radio locating beacon type BE310 (NSN: 5825-99-952-6481), and:
Quote:
Ref. No. Stole 22C/1182 CO2 Cylinder - 34 grammes 6D/1865 Operating head type M 6D/1624 Water activated light 5A/4216 Fluorescein sea marker 22C/1185 Whistle 22C/1186 Lifeline and toggle 22C/1739 Ground / air emergency code 22C/2366 Heliograph (2in x 2in) 22C/2364 Nylon rod (for closure of pockets) 22C/1862 Signal Miniflare Mk1 12D/1393
This image from a Beaufort sales brochure shows the components of the Mk6 life jacket.