High quality material: Designed for Apple Watch 38/40mm 42/44mm Series 1 (2015), Series 2 (2016), Series 3 (2017),Series 4 (2018). Series 5 (2019),Series 6 (2020),Series 7( 2 0 21 ),Series 8 ( 2 0 22 ) ,Series 9 ( 2 0 23 ) ,Series 10 ( 2 0 24 ) These are polished by a number of processes and colored by vacuum plating.
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