KS-21S / Black with Antique Bronze Script Products » Gaines » KS-21S / Black with Antique Bronze Script KS-21S / Black with Antique Bronze Script $269.00 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 20 25 30 40 50 75 100 Keystone Signature Series Mailbox – Black with Antique Bronze. Durable aluminum construction with a proprietary textured powder coat.