All pieces available at the OMNIA online store are certified by INCM – Oporto Assay Office.

The INCM Assay Offices provide that guarantee by verifying the legal fineness (parts per thousand of precious metals contained in an alloy) and applying the hallmark next to the manufacturer or equivalent responsibility mark.

The application of assay office marks is only mandatory in pieces that weigh more than 2 grams.
See the table with the marks of the drawings of legal punches.