N1 to N100000 was 1969 to 1972. I would guess yours to be about 1972.
Any ideas of date of manufacture.
Also, it's lock-up with all springs at rest is very loose. Firm when hammer cocked or trigger all way back. Is this normal ? None of my other Smiths are like this.
1977. While real loose at rest ain't great as long as it's firm when cocked / trigger squeezed it's good to go.