Total mintage of OnChain CS will be 20k (10k reserved for presale OnChain token swap, other 10k for direct purchase).
220k left for physical stamp. You can see which one is rarer. ;-)
Crypto Stamp version 1.0 OnChain has the attribute with different possible status “Shop Status: Initial/Sold/ShippingSubmitted/ShippingConfirned”. Initial means still at Onchain Shop available. With status sold you can order via smart contract the physical counterpart. This special physical stamp does not have the private keys/seed because you already have the NFT. Instead there was a special text: „this crypto stamp was bought and delivered after purchase via smart contract“
For Crypto Stamp 2.0 OnChain there might be same solution to use attributes to distinct from normal physical, OnChain sale and from Presale OnChain Token.