I'm 46, live in Barranquilla and have been collecting coins since I was 8 years old. I've been looking with interest at some cobs recently and found this group which I believe will be of GREAT help.
1970 COMPASS-
WHITES SILVER EAGLE-
WHITES DFX, 4X6DD COIL, 6X8DD COIL, 950 COIL, 10X12SEF COIL-
GARRETT PRO POINTER AT, GARRETT AT PRO , MINELAB EXPLORER SE with 8.5x12.5 Cors coil