#8588 Bend Knee Barbie from Europe that sold in 1973 and #1155 Action Barbie from the U.S. that sold in 1976 are the same doll. They just have different packaging. Both have the non-twist waists and both have bendable legs.
Disclosure: eBay & Amazon Affiliate - When you click through to buy products I may earn a very small compensation. Your purchase helps keep MyVintageBarbies up to date for my readers. Thank you so much for your support!