This interesting bit of glass was made as a giveaway item and attached to bon-bon, baskets, and compotes by a bit of putty when purchasers visited the Fenton factory. This would certainly explain the scarcity of the Butterfly ornament, for few are around today.... Various estimates put the number of pieces still in existence between 30 and 50 in total including all colors.
To insure that this piece is not a reproduction, I contacted Fenton directly with that question. The following is a copy of Fenton's response:(original copies of correspondence is available on request). The butterfly you pictured (about 3 wingspan) was made only in the early years c. Our mould inventory records do not include this mould, so it was likely retired or scrapped many years ago.
I trust that serious collectors will recognize James Measells' name as he authored many of the Collector Series Books; and that they would have also verified the rarity of these ornaments. Please view the photos carefully where you will be able to see any of the conditions mentioned above. Thank you for looking, and good luck! The item "Antique Fenton Carnival Glass Butterfly Ornament Very Rare Cobalt Blue B439A" is in sale since Tuesday, August 20, 2019.
This item is in the category "Pottery & Glass\Glass\Glassware\Carnival Glass\Vintage (Pre-1940)\Fenton". The seller is "bits-pieces1983" and is located in West Warwick, Rhode Island. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Colombia, Panama, Jamaica, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Peru, Pakistan, Paraguay, Reunion, Viet nam, Uruguay.