When was bip39 introduced https://bip39marco.mystrikingly.com/ While it takes advantage of BIP32 approach you can still import BIP39 seeds into Electrum wallet. Also apart from BIp32 There is certainly BIP44 Edition which some wallet use with the generation of seeds. BitBox02 - A successor into the BitBox sequence, this hardware wallet https://totalbookmarking.com/story20450423/bip39-validate-mnemonic-the-single-best-strategy-to-use-for-bip39-recovery-tool-https-www-youtube-com-channel-ucupxfytj0fb78sq55hu6ocw