My guess was pre-1935, allowing for those '20s body styles to still be common enough.
But, I see that you've nailed it down a bit better.
A little exercising of the Google-Fu shows that that style of license plate was only issued from 1921 to 1926, and the number layout and sequence favors
1926.
Some photo comparison shows that it could possibly be a '26 Whippet. Several grille, radiator, shroud, and headlight styles are seen on pretty much all years, including '26. And '26 was the year that the Overland was phased out (along with its different fenders), with the Whippet taking its place (and also using left over parts, most likely).
And, hey, you could buy the 1926 Coach model for only $535!