Strange HK33 Barrel Proof Marking

[Tailflash]

Any idea of what this proof marking is on this HK33 barrel or where it might have been proofed? Never seen this mark before...
Picked these two '178' marked barrels up around 10 years ago; the 53 has standard eagle/N proof & '53' marked trunnion.

 

[Brad4065]

Any idea of what this proof marking is on this HK33 barrel or where it might have been proofed? Never seen this mark before...
Picked these two '178' marked barrels up around 10 years ago; the 53 has standard eagle/N proof & '53' marked trunnion.
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I've got a few 53 and 33 178, and they don't have those marks.

@AGG have you seen this?

Cheers!!!!

 

[AGG]

I have seen these proof marks on the HK33K (English parts kits):

Definitive nitro proof for all guns- parabellum pistols
London Proof House
Since 1904

Tony

 

[Brad4065]

I have seen these proof marks on the HK33K (English parts kits):

Definitive nitro proof for all guns- parabellum pistols
London Proof House
Since 1904

Tony

Thanks T

You are the end all be all!!!!!!

Cheers Homie!!!!!

 

[flybynt]

Tony is 100% on target, here is a pic

 

[Tailflash]

Wow, thanks guys. Will go nicely with this Bolt then...

 

[MMissile]

Had one of the Brit kits....

 

[GuntherRommel]

Good to see you posting again @MMissile , Cheers

 

[Brad4065]

Good to see you posting again @MMissile , Chhers

Common man....it's spelled "Cheers".

 

[GuntherRommel]

not when your drinking heavy Brad