Mewtwo & Mew GX SM191/248 SM Black Star Promos Pregrading Report
Card photos and centering analysis
This is a GradeValue pregrading report for Mewtwo & Mew GX SM191/248 SM Black Star Promos. Based on centering and surface analysis, the estimated grade is approximately PSA 8. Raw copies are worth about $361.75, while a graded PSA 10 is around $1,890.76. That works out to an estimated grading ROI of about 0.9x. Use this analysis to decide whether to grade it or keep it raw.
Grade
Estimated pregrade: PSA 8. This is a pre-submission estimate from centering and surface condition.
Centering
- Front: 61/39 top-to-bottom, 56/44 left-to-right
- Back: 59/41 top-to-bottom, 48/52 left-to-right
Corner analysis
- Front corners: 97/100
- Back corners: 100/100
Value: raw vs graded
| Raw / ungraded | $361.75 |
|---|---|
| PSA 9 | $515.00 |
| PSA 10 | $1,890.76 |
| BGS 10 | $4,490.91 |
| CGC 10 | $1,055.71 |
| Estimated grading ROI | 0.9x |
How GradeValue pregrading works
GradeValue is a pregrading tool for trading cards. Upload front and back photos and it measures centering, flags surface defects, estimates a likely grade, and compares raw versus graded market value so you can decide whether a card is worth sending to PSA, CGC, or BGS.
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Related research
Grading ROI for the whole set, from live prices.
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Report updated September 10, 2026.