This is what I received form Corning Museum of Glass:
Thank you for your question. I have attached a scan from a book about the Ingrid line by Hoffman and Schlevogt, Czechoslovakian glass makers. A head matching the images you sent is pictured in the trade catalog section of this book. However, I cannot seem to find any information about the Arcadia sticker. Schlevogt and Hoffman generally marked their pieces with a butterfly or an Ingrid sticker or mark. I have read articles indicating that after the company dissolved the molds were sold to other glass companies. The mold for this piece, may have been sold to another company. Articles have also been written indicating that works by Czech companies from this time period are often reproduced and sold as originals by companies in the Czech Republic and importers. Unfortunately, I cannot help you determine if your piece is from the Ingird line or not. You may wish to contact an appraiser to have your piece authenticated. Best of luck.