Usmc captain uniforms opinions

Dear Gents

USMC is not my collecting area and a friend gave me as gift this USMC uniforms:jacket and pants and I would like any light about rank that I supposed for a captain but I don,t know for sure if the silver bars matching with this type of dress uniform instead the black bars,on the other way what is this lanyard used for and finally I would like date(I was said in another place stuff is last 60,s mid 70,s)this militaria
Sorry if it is the wrong place to post it
Thanks in advance

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