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
Its not a modern button. Its probably at least 100 years old. Nice find Allison.
It called an Advertisement button and it was used on underwear, trousers or shoddy mens suits. Silversimon is the only one that has a site on these old 4 holed advertisement buttons but I didnt save it.