Bip39 metal http://www.mediafire.com/file/uilrjfajg2ami24/pdf-14673-57158.pdf While it takes advantage of BIP32 strategy you'll be able to still import BIP39 seeds into Electrum wallet. Also besides BIp32 There's BIP44 version which some wallet use for that era of seeds. As opposed to standard wallets derived exclusively from a seed phrase, passphrase-safeguarded wallets are https://socialstrategie.com/story5538574/bip39-decoder-new-step-by-step-map-for-bip39-standard-https-x-com-tundra838554