The 5-146261-1: This is a 2-position, dual-row, unshrouded breakaway header from the AMPMODU Mod II series. Gold on the mating face (30 µinch thickness) gives this header a rated mating cycle life well beyond tin-plated alternatives — in a field-service application where the connector is cycled a few times a year, that gold layer prevents contact fretting over decades of service.
The closest functional alternative is 1376779-2 — also a 2-position, dual-row, unshrouded header with gold mating finish. The key difference: 1376779-2 uses 8 µinch gold on the mating face versus 30 µinch on 5-146261-1. For low-cycle applications the thinner gold is adequate; for repeated mating or corrosive environments the 30 µinch layer provides a wider safety margin.