What type of AC Contactor is this?

Hi,

I would like to replace my contactor for my old AC unit. Not sure how old the unit is but the house was built in the 1950s. Can someone let me know what type of contactor this is and where I can purchase?

Thanks,

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source https://hvac-talk.com/vbb/threads/2238878-What-type-of-AC-Contactor-is-this?goto=newpost