British MK V helmet

These are pictures of a British Mark V steel helmet.
The only difference between the Mark IV is the liner system.
The Lift Dot stayed.

There are no markings or inscriptions in the metal of the shell.
 
Text on the liner: C.W.L  1985 CN 8415-99-973-6750
Text on the sock W.S.M LTD CN 8415-99-973-6749
I haven't found any information on these companies.

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National Stock Number:
8415-99-973-6750
Federal Supply Class:
8415
National Item Identification Number:
999736750
Description:
SPIDER CROWN,STEEL

Manufacturer Information:
23-367  U1725 MINISTRY OF DEFENCE AIR DOMESTIC R FERENCE NUMBER USE ONLY
CN 2252 K2203 MINISTRY OF DEFENCE ARMY
CN 2252 U1269 MINISTRY OF DEFENCE - DEFENCE LOGIST S ORGANISATION DLO
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