Possible to restore an Electrum wallet with partial (12/13) seed?
There are only 2048 possible first words, if your other 12 words are correct, this guarantees that you will find the seed. Here is the list of possible words for English:

https://github.com/bitcoin/bips/blob/master/bip-0039/english.txt

There is also a checksum involved in the seed, so it's possible to narrow down the list further if you can program a bit. Best of luck.