Help with Naval WW2 British Primer

[Weasel]

Hi All,
These are not more area at all, so wondering if someone can please help me with info on what case this primer was used in. I don't have the primer as these pictures were sent to me.
Best Weasel.

 

[AE501]

I know that Primer Electric No 17 was used in the Land Service in Cartridge QF 20 pr Tank HE and Blank, but this is a Naval version and was used in all 5.25" AA gun cartridges.

 

[Weasel]

Thank you AE501,
That is vety helpfulI, i will pass that on. I will have to look up the 5.25" AA gun, not a weapon I am familier with.
Best Weasel.

 

[2pounder]

no. 17 E also used in 4.5in FA and ASM Mk10

 

[AE501]

Primer Electric No 17 was also used in the Cartridge 120 mm L1 gun for the Conqueror tank.
The Primer Electric No 17 was a naval design and the Mk 1 was only used by the RN.