New to me code on HS

Hi, any idea what these codes mean?
IMG_20181017_0002 IMG_20181017_0003
First is a 6,5 X 52 second is a 8 X 57

first time i have seen these.

J

The 6,5 X 52 is SMI 931.

Sorry, found link to other thread!!!

SMI:
Societa Metallurgica Italiana

BPD:
Bombrini Parodi Delfino

Both Italian.

At 6h you have the production year (last 3 digits)

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