Please help identify Portuguese marker id

[Gerox]

Hi All,
There is a nice solid silver box.
The box is dated on the ground "Lissabon 1966".

The guarantee mark excludes 833 silver fineness and the Assay Office Porto.
I can't identify the maker's mark.

I'm hoping one of you knows the maker.
As always, any help will be greatly appreciated.
Gerox

[Funkel]

Encima de la figura aparece una letra, me ayudaría mucho si me puede decir cual cree que puede ser.

Above the figure appears a letter, it would help me a lot if you can tell me what you think it can be.

[Gerox]

Encima de la figura aparece una letra, me ayudaría mucho si me puede decir cual cree que puede ser.

Above the figure appears a letter, it would help me a lot if you can tell me what you think it can be.

Hi Funkel,
Yes, the letter above the figure looks like a big "P" or a small "r". The figure itself looks like a flowerpot.
Would be great if you could identify the manufacturer.
Best regards
Gerox

[Funkel]

Sorry for the delay. it is neither "P" nor "r"

[Gerox]

Hi Funkel,
Thank you very much!
It is possible that it is a devious A looks at least very similar.
Best regards
Gerox

[hbraga]

Hi, the photo is inverted, the letter it is a "J"...

[hbraga]