The Electrum wallet was published in 2011 and originally used it's own recovery-phrase AKA seed-phrase system before BIP-39 was written. Their system did not use a fixed word list.
I suspect a 25 word phrase is likely to be a 24-word seed-phrase plus one passphrase.
From what I have read, Electrum seed phrases had 12 words not 24. Maybe there was a choice in the 2011 version?
I would try Electrum anyway.