Not very familiar with these dolls, but from what Ive read it appears to be a #4. Nail polish looks good, as so does toes.
Please check pictures for answers. Couple of nicks out of the hip where its connected to the leg. The item "Vintage Ponytail Brunette Hair Ponytail Barbie #4" is in sale since Thursday, June 21, 2018. This item is in the category "Dolls & Bears\Dolls\Barbie Vintage (Pre-1973)\Vintage (Pre-1967)". The seller is "jrnation888" and is located in Lynchburg, Va.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, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Israel, Mexico, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Guatemala, El salvador, Honduras, Jamaica.