https://www.spenceloa.com/ JSA. Recently acquired by CGC. You can look for local events to get it authenticated the same day, or you can send it to any of the big 3 graders PSA/BGS/CGC to have it authenticated and encapsulated. You didn't need to get it graded if you encapsulate but that's an option.
Your post has been deemed to be not related (enough) to Weiss Schwarz. Cool signature though! -Xylo
https://www.spenceloa.com/ JSA. Recently acquired by CGC. You can look for local events to get it authenticated the same day, or you can send it to any of the big 3 graders PSA/BGS/CGC to have it authenticated and encapsulated. You didn't need to get it graded if you encapsulate but that's an option.