Hi Konrad,

Thank you for contacting Mearto with your appraisal inquiry.
The closest comparable example I could find to your guitar was another Schecter Guitar Research C-6 Deluxe model signed by Morris Day and The Time and sold in 2016 for charity, for $1,225 (https://www.worthpoint.com/worthopedia/schecter-guitar-autographed-morris-1826312346 ). I think YOUR guitar would bring more money - almost certainly double that, possibly even triple it.
Based on the photos and information provided, and subject to examination, this is:

An autographed Schecter Guitar Research C-6 Deluxe guitar
signed by Rings of Saturn, Meegs, Marylin Manson, Keith Marrow.
probably with a basswood body, maple neck and rosewood fret board
CONDITION: appears to be in excellent condition
PROVENANCE: acquired in 2017 at the Boys and Girls Club of America auction in Westlake Village, Calif.
$2,500-3,500*
*represents a fair-market value for auction purposes; retail or asking price may vary.

Please let us know if you have additional items to appraise, or questions/concerns, and thank you again for using Mearto.
~ Delia