Made in crystal 1947-1951. It measures 11 3/4" x 6". In Florence 40-50-60's (9th edition) this tray is listed as 6 3/4" wide; this one is just a tad under 6" wide.
Trays are found in crystal and with a sprayed on blue or red color. This tray appears to have had the spray color removed everywhere except for the indented flower motif. It looks in this photo like there is gold around the rim and at one time there might have been, but in this photo that effect is produced by a reflection off the red.