Unknown seal standard

[Chiwahua]

I'm trying to find the standard of this seal.

I thought it might be a BSPP seal but the thickness of the seal doesn't correspond to DIN 3869.

Do you have an idea about this seal corresponds to what standard and number (ISO XXXX ? DIN XXXX? SAE XXXX?)

Thank you

 

[BEMPE16524]

Try to ask from any supplier or manufacturer.