Markings on H.C. Bomb 12,000 lb

[Antoon]

On a German drawing made after recovering one of the 12,000 lb. H.C. bombs that was dropped in the morning of 16 september 1943 by 617 Squadron RAF (The Dambusters) on the Dortmund-Ems canal are some markings. Because there was no weight on the HE sections, the Germans thought that the bomb was a H.C. 9,000 lb.

On the sections filled with High Explosives:
EXP
G.D. 9.43
TX 2
RA 2/2080.

EXP = EXPLOSIVES?
TX 2 = Torpex 2
9.43 is the filling date, but witch factory is G.D.?
And what is RA 2/2080?

On the tail :
S.B. 39082
R.D. Arm 4(B)A.V.

Witch factory codes are these?

Any other info on the factories, etc. that made this bomb or bomb sections is welcome. I know it was a H.C. 8,000 lb. bomb with an extra section in the middle, and must be the Mk I.
Also want to know the exact location where the bomb was found?

Greetings - Antoon

 

[Hoeksel]

For G.D. (GB) I have Royal Ordnance Factory, Glasgow.

 

[TimG]

GD - ROF Glascoed (Wales)

TimG

 

[Hoeksel]

I actually had both names in my list and when I saw that I assumed I made a typo (Glascoed / Glasgow) ;-). Knowing you are on this topic, I will fix my reference error. Thanks.