Signed vintage modernist brooch in sterling silver & 10K solid gold

A simple but lovely piece that looks to me like a bejewelled sunrise or sunset. Crafted of sterling silver with enhancements in 10K gold, the brooch measures about 1-2/3 inches across. Marked JPA 925 - 10K on the back. It's in great condition, with the brushed finish of the sun hiding any scratches. I have found similar silver and gold pieces with the same maker's mark, but have yet to track down any information about JPA. Your input is welcome!