Chrysanthemum Reissue, Imperial, Summit
If these chop plates look like the old one, you're right. It's the same size and pattern, but have been made as a reissue by Imperial or Summit. Made in marigold, smoke, white, and ice blue from 1965 to 1970 by Imperial and it's successors. Summit has since acquired the mold and is making the plate in a number of other colors. Unless stated as ebay sales, prices are for live auctions.

Blue, 25-40
Blue, 33 (ebay 2003)
Green, 33 (2002)
Ice blue, 65, 250 (both 2016)
Marigold, 35 (2013)
Marigold, 25 (ebay 2004)
Purple, 35-40
Sapphire blue, 55 (2002)
Smoke, 70 (2014)
Smoke, 26, 51, 52 (all ebay 2003)
White, 13 (2014), 20 (2015), 15 (2016)

Updated 2/20/2017