CREATE TABLE table_51194 ("Year" FLOAT, "Theme" TEXT, "Artist" TEXT, "Composition" TEXT, "Mintage" FLOAT, "Issue Price" TEXT)

What was the theme when the issue price was $508.95?
SELECT "Theme" FROM table_51194 WHERE "Issue Price" = '$508.95'
SELECT "Theme" FROM "table_51194" WHERE "Issue Price" = '$508.95'