You can check an NFT's Token ID in the NFT detail page. There are two types of NFTs in ISKRA Market: An NFT with only one quantity per Token ID, and an NFT with several quantity per Token ID. There could be several owners of the same Token ID for the latter case. For example, in case that an NFT's Token ID is 100, and its quantity is 500, there could be several owners of the Token ID 100.