hi Marti,
very late 50's/early 60's vote.....and it's a gown, not technically a slip, from the looks of those straps. Several companies did higher end lingerie with those organdy type labels, VF gold label, Hollywood Vassarette which merged with Munsingwear, and others I can't remember this late, I'll check in the am. Seems like it was done as competition with some other, higher end line like Lucy Anne or similar. What's the length on the gown/slip??
Holly