•Save 10% on all online submissions — Code: GRADE10•Tamper-evident graded slabs•Live population registry•Trusted by collectors, dealers & auction houses•Save 10% on all online submissions — Code: GRADE10•Tamper-evident graded slabs•Live population registry•Trusted by collectors, dealers & auction houses
Get in touch
Contact MAS Grading
Questions about grading, submissions, or your order? We're here to help.
Mail-in (USPS)
MAS Authentication
PO Box 3153
McAllen, TX 78502
UPS / FedEx
MAS Authentication
620 E Pecan Blvd #3153
McAllen, TX 78501
Please include your submission number (if you have one) so we can help you faster. For grading status, sign in and visit your portal.