Valid Bip39 Seed Phrase Though it uses BIP32 approach it is possible to still import BIP39 seeds into Electrum wallet. Also other than BIp32 There's BIP44 version which some wallet use for that era of seeds. One particular list of mnemonic may be used to develop multiple addresses. This process https://livebackpage.com/story3978116/recovery-seed-phrase-generator-bot-the-fact-about-bip39-that-no-one-is-suggesting