BRAND NEW SEF 18" x 15" SEF coil for SD, GP, GPX series... See pics... not a scratch on the bottom.... Price was $299.00USD from Kellyco, selling for $175.00 and I'll pay for shipping.
Info borrowed from this site: http://bestmetaldetectors.eu/accessories/detech-search-coils-for-metal-detectors-accessories/detech-search-coils-for-minelab-detech-search-coils-for-metal-detectors/detech-18x15sef-search-coil-for-minelab-gpx-gp-and-sd-series-detectors.html
Detech 18 X 15" (45cm.x38cm) SEF coil Compatible with all Minelab SD, GP and GPX detectors. Complete with coil cover Lightweight open coil. Middle size to allow user to cover more ground in less time resulting in finding more gold. Very similar to the larger 21 x 17. Will go deeper and give better performance when searching for GOLD. Very stable and very accurate pinpointing to locate even your smaller Gold finds. Field tests show the S.E.F. search coils really find deeper targets-many missed by other search coils.