~/Library/Application Support/1Password/1Password.agilekeychain/data/default/

Only the password itself is encrypted. Everything else is just sitting there in JSON.

   ~/Library/Application Support/1Password/1Password.agilekeychain/a/default/files

The attached files do appear to be encrypted, but I don't know how well. The names of the files aren't however, and they may be enough to expose or incriminate you.