It's a MKI, I found the link to contact Line 6 but it seems more geared towards repairs/troubleshooting/registration. Was kind of hoping some staff crawling on here would see it and help out.
Hey guys I have a Line 6 Spider Valve HD100 that I was trying to determine a manufacture date on. Serial is (21)SVH1S5834001564 Any help would be appreciated. Thank you! John