Abbreviations in 1939 register

[megsnan]

I unlocked a record for someone who was single and at school when the register was taken, subsequently married in 1943, divorced on 28 March 1950, married 29 April 1950, widowed 5 February 1982 and died 2013. I can see her name was changed twice, which was correct, but I can't work out the abbreviations in the first column. I thought they might relate to her date of divorce or widowhood, but they don't match up. Does anyone have any idea? I think DDK refers to Halstead in Essex, but it is the rest of the figures that I can't understand.

[ScouseBoy]

What troubles me, is that the original register has been subsequently amended and altered. 

[megsnan]

The Register was altered when women married and their name changed.

I have one record which shows DBD M and a correct date of marriage next to the M.  Another record was of a woman who was married when the register was taken but subsequently remarried.  Her record showed DBD M 1C and correct date of the second marriage. DBD is the registration district of Billericay
(I found a link to the district abbreviations -
http://www.findmypast.co.uk/articles/1939-register-enumeration-districts?sourceID=13&utm_source=affiliate&utm_medium=affiliate&utm_content=LostCousins&utm_campaign=%20fmp_uk&awc=2114_1448818677_2b68d72cf7eeea1e077910af1b3e4a2e&dclid=CJTz9pOWtskCFSNR2wodspoKMg.)

DDK, on my mystery record, I now know, is Halstead.  However the dates are not marriage dates. And what does M/1C and 1C/M mean?  I thought it might be something to do with another ID card being issued in a married name, but another record on the same page, with a remarriage in 1946, does not have it annotated.

[KGarrad]

What troubles me, is that the original register has been subsequently amended and altered.

The 1939 National Register was subsequently used by the NHS - who made necessary changes.
Why does that trouble you?

[ScouseBoy]

What troubles me, is that the original register has been subsequently amended and altered.

The 1939 National Register was subsequently used by the NHS - who made necessary changes.
Why does that trouble you?

   It is no longer the "1939 Register"   It becomes the  "Amended 1939 register"  and no longer as valuable.

[Ruskie]

What troubles me, is that the original register has been subsequently amended and altered.

The 1939 National Register was subsequently used by the NHS - who made necessary changes.
Why does that trouble you?

   It is no longer the "1939 Register"   It becomes the  "Amended 1939 register"  and no longer as valuable.

Surely it is more valuable as it provides further information about that person? 

[Mean_genie]

The term '1939 Register' was only coined to describe the current online release. At the time it was taken it was referred to as the National Register, and subsequently as the Central Register. But the volumes created from the initial 1939 enumeration were only part of the National or Central Register, since new registrations were being added continuously while the paper-based system was in use. Since only the original registers are being released, a new name was required to distinguish them from the later (closed) volumes.