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From 1 Sept 2021 the pens and certificates have a nfc tag for certification and provenance.

The tag can only be read when there is no converter in the post of the pen. The pens tag, the certificate tagm the sku the product and the invoice reference form together a join for certification.

Should you ever sell the product, then please inform me about this and to whom.
The buyer has to contact after this to get a new invoice reference.

Please contact me in case a pen is lost or stolen so I can keep track on this.