Help dating an 18-3

[Kajanone]

Picked up a GB buy today. An 18-3 with serial 1K944XX. I would greatly appreciate help dating this S&W.

 

[JP@AK]

1971 production. 1K39501 - 1K99999. Doesn't necessarily mean it shipped that year, of course.

 

[Pine_Worker]

I usually go with roses and wine. Generally works for me.