1941 Pattern | Stores Ref No's: 22C/447 Medium | 22C/448 Large |
Mk1 Basic | Stores Ref No's: 22C/447 Medium | 22C/448 Large |
Mk1 Modified | Stores Ref No's: 22C/1116 Medium | 22C/1118 Large |
The name "Mk1" was at some point bestowed upon the existing 1941 pattern life jacket. I found this out by finding the Stores Reference 22C/ numbers for the medium and large sizes of the 1941 pattern and the Mk1 are the same.
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Stores Ref. Nomenclature 22C/xxx xxx