I want to find Bitcoin from an old paper wallet

A few years ago, maybe around 2012-2014, my father got some packages from his friend. And yesterday my dad gave me a package. This included paper along with metal bitcoin coins. Instinctively, I thought it was a kind of Bitcoin paper wallet. There is an unusual format for paper wallets.

Along with the QR code there is a three-line string written there.

The string is in the following format:

zt {8 digit number} go

{18-digit number}

M12-02-12 // Probably the date on a paper wallet. I think so.

A QR code represents a combination of these strings.
{18 digit number} .zt {8 digit number} go

I think it follows the form of some companies or services, not just BTC addresses. How can I find a pattern to recover Bitcoin?