Badge had three classes.
First two classes were made in pure silver or silver-colored alloy and third class in bronze.
The suspension of 1st class badges reads
一等精勤章 - 1st class badge for diligent work
Reverse (regardless of class) reads
日本海員掖済会 - Japan Seafarers Relief Association...
japan seafarer relief society badge
japan seafarers relief association badge
japan seafarers relief association diligence badge
japanese badge
日本海員掖済会章
日本海員掖済会精勤章
精勤章