The RN is only 4 numbers - 1717. I don't know if it's missing a number or if one somehow faded? The union label has care instructions. No other label on it.
http://vintagefashionguild.org/lingerie-guide/ http://vintagefashionguild.org/label-resource/ilgwu These may help you. Very pretty.
Thank you. I was able to find one like it on google images from an eBay ad, confirming it's made by Ginsburg (GMC) and likely from the 60s. Mine is missing the matching nightgown.
