It may not be on here yet. Unfortunately, the photo you provided cuts off the pattern number. Based on the envelope design and style of dress, it appears to be from the first half of the 1950s.

Don't know the exact pattern number of hand, but based on the packaging I would say 1950s with a pattern number starting with a 5, 6, or 7.

They were the ones with the brown Butterick logo.

Good luck!