Model 15-4 Birthdate Please

[Skybull]

Hello- I just purchased a previously owned Model 15-4.
Serial number is: 21K05XX.
Can someone please tell me when it was manufactured?
Thanks!

 

[GunarSailors]

1977 according to the SCSW

 

[Skybull]

Thank you for the information!

And thank you for your service to our Country!

You are a long way from home!