AFAIK, the only tank with an oscillating turret automatic reloading systems was French AMX-13, one of the best light tanks ever built. Much less known is that in early 1950s US Army had a numeber of tank protos built and tested. US designs were for medium and heavy tanks. I have info on three of these projects.Don't assume that thery were created in the order I present them.
First in the T54E1 (frist image): used the M-48 chassis with an oscillating turret and a 105 mm gun. Turret was designed and built by United Shoes Manufacturing. This project was considered quite high priority, because a parrallel design without oscillating turret, the T54E2, was pursued: it had a 105 mm gun with a semi-automatic reloading system designed by Detroit Arsenal. Neither were series built.
Second is the T57, based on the chassis of the T30 heavy tank with an oscillating turret and a 120 mm gun. I have only chasssi photo.
Third was a medium-to-light tank, based on the chassis of the T-42 (same as the M-42 one) and a 90 mm gun in an oscillating turret.
Has someone more infos on these and other US projects with oscillatiing turrets. And any info of oscillatin turret tank from other countries?