After I posted I noticed this earlier posting with serial numbers for the Rochester Ordinance Wild Fowl guns, and your number is not on the list; but regardless, yours is a very uncommon Smith gun. However in this post you'll note nine guns listed, BUT exhaustive records research revealed only 8 examples recorded; so this data may or may not be complete? So get a research letter and verify exactly what it is you have.

"Thanks Will. I guess that makes it nine total for LC Smith LRWF with military markings. Here is the consolidated list:
1. 197579
2. 197610
3. 198009
4. 198620
5. 198621
6. 198629
7. 198636
8. 198947
9. 199737"