Interestingly this badge is absent from the official badge chart of association that was published in 1939 https://asiamedals.info/threads/membership-and-merit-badges-of-the-navy-league-official-chart.23263/
So it must be introduced after 1939.
Early badges.
![2.jpg 2.jpg](https://asiamedals.info/data/attachments/316/316379-bd0fb7ac8fafbe4f14ee2e848531436e.jpg)
![5.jpg 5.jpg](https://asiamedals.info/data/attachments/316/316380-a5d450dac9cdf1221f6ffa0457f02e56.jpg)
Reverse
有功會員徽章 - Meritorious Member Badge
海軍協會 - Navy League
Made in heavy metal with hot enamel.
![4.jpg 4.jpg](https://asiamedals.info/data/attachments/323/323758-aedde8bd49327e81fa56760e454f8579.jpg)
Original case.
![8.jpg 8.jpg](https://asiamedals.info/data/attachments/323/323759-f05deea48f589e98bb7bedf2ce7c219b.jpg)
![1.jpg 1.jpg](https://asiamedals.info/data/attachments/323/323760-149740b11320104bc66124aa3bcc2572.jpg)
All known badges (both early and late war types) were made by Taishodo workshop in Tokyo https://asiamedals.info/threads/badges-and-other-products-of-taishodo-watch-shop-tokyo.15302/
The other possible manufacturer of these badges could be Akiba workshop.
![7.jpg 7.jpg](https://asiamedals.info/data/attachments/323/323761-3e970fd3014ae2d12336009d33969dbc.jpg)
![25-.jpg 25-.jpg](https://asiamedals.info/data/attachments/323/323762-0d5cc1337b1dc2d7e8e52343dc868fe8.jpg)
Inside the case
昭和十六年十月二十五日 - October 25, 1941
お受 - received
Looks like early badegs were issued (at least) until autumn 1941.
So it must be introduced after 1939.
Early badges.
![2.jpg 2.jpg](https://asiamedals.info/data/attachments/316/316379-bd0fb7ac8fafbe4f14ee2e848531436e.jpg)
![5.jpg 5.jpg](https://asiamedals.info/data/attachments/316/316380-a5d450dac9cdf1221f6ffa0457f02e56.jpg)
Reverse
有功會員徽章 - Meritorious Member Badge
海軍協會 - Navy League
Made in heavy metal with hot enamel.
![4.jpg 4.jpg](https://asiamedals.info/data/attachments/323/323758-aedde8bd49327e81fa56760e454f8579.jpg)
Original case.
![8.jpg 8.jpg](https://asiamedals.info/data/attachments/323/323759-f05deea48f589e98bb7bedf2ce7c219b.jpg)
![1.jpg 1.jpg](https://asiamedals.info/data/attachments/323/323760-149740b11320104bc66124aa3bcc2572.jpg)
All known badges (both early and late war types) were made by Taishodo workshop in Tokyo https://asiamedals.info/threads/badges-and-other-products-of-taishodo-watch-shop-tokyo.15302/
The other possible manufacturer of these badges could be Akiba workshop.
![7.jpg 7.jpg](https://asiamedals.info/data/attachments/323/323761-3e970fd3014ae2d12336009d33969dbc.jpg)
![25-.jpg 25-.jpg](https://asiamedals.info/data/attachments/323/323762-0d5cc1337b1dc2d7e8e52343dc868fe8.jpg)
Inside the case
昭和十六年十月二十五日 - October 25, 1941
お受 - received
Looks like early badegs were issued (at least) until autumn 1941.