The difference is followings.
Part number Contact plating / Shell plating
HR10A-10P-12S(73) : Silver / Nickel
HR10A-10P-12S(74) : Gold / Nickel
HR10A-10P-12S(78) : Gold / Black chromium / without rubber bushing and metal clamp
Part number Contact plating / Shell plating
HR10A-10P-12S(73) : Silver / Nickel
HR10A-10P-12S(74) : Gold / Nickel
HR10A-10P-12S(78) : Gold / Black chromium / without rubber bushing and metal clamp
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