Crossrock Master Series Acoustic Guitar Case for Martin D-28 / Grand Auditorium | Olive Green Eco Tweed Fabric, Re-Engineered Shell, Leather Handle & Forest Green Velvet Interior(CRW720D28OG) Martin D28 Olive Green is up for auction in Musical Instruments. The current bid is $37.89, 78% below the $169.99 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.