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Service Studs
From Warhammer 40k - Lexicanum

Various types of service studs attached to Space Marine foreheads.[1]
Service Studs are metallic studs attached to the skull of a Space Marine, which visibly protrude through the skin of the forehead. The awards signify the number of the Marine's years in service to the Chapter. Different designs and shapes of studs denote different lengths of service.[1] A stud will represent either 10, 50 or 100 years service, depending on its style and the material it is made from.[2]
However, the practice of Service Studs is falling out of favor with many Chapters.[1]
Chapter Variations
- Dark Angels
- Soul Drinkers
- Silver stud - 10 years of service as a battle-brother.[4]
- Ebony stud - 10 years of service with the Chaplaincy.[4]
- Ultramarines
- Gold stud - 50 years of service.[5]
Sources
- 1: Insignium Astartes, pg. 62
- 2: White Dwarf 68 (2015) - Ask Grombrindal
- 3: Ravenwing (Novel), Two - The Black Knights
- 4: The Bleeding Chalice (Novel) - The Soul Drinkers Omnibus, Chapter Six
- 5: Nightbringer (Novel) - The Ultramarines Omnibus, pg. 6