Can anyone date these?

[Parrisjr]

Can anyone date these two revolvers

19-4. 57k3897
And
17-4. 97k2439

Thanks

 

[brick]

The 19-4 is 1980 and the 17-4 is 1981 by the book.

 

[k22fan]

Welcome to the forum. (not by the book)

 

[Parrisjr]

Thanks and happy to be here!

 

[Parrisjr]

Here is one more. I think it is a 78 or 79?

19-4. 41k7960