This is a vintage 1960s 1970's Syn-Co brand Mosiac Japan celluloid thumb guitar pick. It is new old stock (NOS) and was manufactured in Japan. The pick features a unique design and was likely produced in the 1960s or 1970s.

Old store stock

62 picks in this box

Thumb and finger

#12 on box label

Deluxe finger &thumb pick assortment