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Part description on:
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Brick, Round 2 x 2 x 1 2/3 Dome Top with Sentinel Face Pattern
Bricklink ID:30151bpb04
Weight:1.250 g
30151bpb04

Sets with this part (from Bricklink)
  Part color Dark Purple
 


 Set nameRelease yearQuantity
7602276022 X-Men vs. The Sentinel20141