Wally:
That box is a big bonus. Sight unseen, I'd probably take it. You are right, I can't remember exact date, but I don't think those walnut grips came in that early. Also, I seem to remember that the first year or so, the colts in the medallions faced forward on both sides of the gun, in other words, there were two different medallions, on for the left, and one for the right.
I'll check on those dates for you...
Edit: Some of this info was copied from "Coltautos.com"... basically, there were four types of standard grips: first there were two types of hard rubber grips, which do not apply here. Then, there were two types of checkered walnut grips:
First of these was the "machine checkered walnut with forward-facing flush medallions on both grips (from approx. serial number 345,000 to 350,000);"
And then there were "machine checkered walnut with forward facing flush medallion on the left grip and left-facing flush medallion on the right grip (from approx. serial number 350,000 to 409,900.)".
If you look at my Colt over on my thread, you will see the serial is 349,104, so it is right at the approximate date that they switched... Mine has the same medallion on both sides, so it is in the second type.
These are listed by serial number rather than year. Colt was something like Smith in that the ship dates did not always correspond to the serial numbers, so this is probably the best way to see if the grips seem to match the gun.
Also... There was available a hand checkered fancy walnut grip from 1913 until 1923. This one cost more than the optional smooth ivory or mother of pearl grip. This is what they look like:
If you have one of these, I would be all over that deal. Even if not, with that box.... I would probably still take it!!!!
Best Regards, Les