1920’s Sterling Morpho butterfly retail wing Art Deco Brooch

Product Name: 1920’s Sterling Morpho butterfly retail wing Art Deco Brooch
This belonged to my grandmother Not sure exact age but I believe it's 20's or 30's Sterling silver Marked England Sterling and I believe a patent number PI 202213. See pics Size reference pics included Rectangle shape Period “C” closure. Reverse painted butterfly wing I did a few searches and believe this retail is a morpho butterfly wing with hand painted design and topped with glass. If ANYONE knows more about this piece please message. Looks almost like a moonstone effect Thomas Mott Shipton CO circa 1920 PRICE VERY NEGOTIABLE . I'm more looking for information on it. :-) Thanks so much Pics are actual item •••Please remember this IS a USED/VINTAGE item. Please do NOT purchase expecting it to be “NEW” and or perfect!! There may be a flaw or two I miss as I am ONLY human. However, I try to get pics from every angle! Make sure to view ALL pics and ask questions so you know EXACTLY what your receiving•••.