Ping An Bank's 3380 silver brick stamps do not belong to the category of stamps, but are actually low-grade handicrafts under the banner of collecting stamps. They are money-circling tools launched by those companies. They flooded the market after 2008, so you don't have to listen to what they say about global limits. The specific value is the current precious metal price multiplied by the weight plus the packaging fee, which is its value. Because the collection value is too low, real collectors will not buy it. If the landlord likes to collect, collecting genuine stamps is more valuable, you can go to the post office.

I hope this helps.