Bip39 test vectors https://www.cheaperseeker.com/u/adeneuwaks Even though it makes use of BIP32 process you can even now import BIP39 seeds into Electrum wallet. Also besides BIp32 There may be BIP44 version which some wallet use for that era of seeds. bip39-phrase.com is an informational weblog devoted to systems and tools for https://webcastlist.com/story21369739/bip39-s-entropy-to-mnemonic-about-bip39-2048-words-https-www-youtube-com-channel-ucupxfytj0fb78sq55hu6ocw