Model 36 DOB

[Papaw]

I just bought a blue Model 36 no dash. Serial number is 780XXX with no J. The grips are numbered to the gun. What year was this gun made? It has some blue wear but mechanically tight. I'll try to add a picture.
Thanks
Papaw

 

[STCM(SW)]

1969 is what my paperwork has.

 

[Papaw]

Thank you!