
Washington, D.C., circa 1920. "Hudson, stolen car." View full size. National Photo Company Collection glass negative, Library of Congress.
I've got a sudden urge to play Monopoly.
It is a very cool Motometer! Thanks Dave for the closeup and thanks Al for the details!
That object is almost certainly a Motometer, an early form of temperature gauge. See http://www.cartype.com/pages/347/boyce_motometer
for details.
Can we get a close up of the hood ornament? Thanks Dave!
[That's a radiator cap. - Dave]

I'm willing to bet that that car could have lasted a whole lot longer than my current car probably will.
"Check Engine" light, indeed!
There is a small alcohol lamp mounted on the left rear fender, I assume that is what you mean. Very likely as a "custom hot rod" of the day, it is pretty sketchy on electrical accessories.
What I really think is neat is the spare on the back, Continental style. I don't know if that was standard then, but it is quite a bit of workmanship from what I can see of it.
[Probably every car made back then, from the Model T on up, had a rear-mounted spare. - Dave]
In red so that I can drive off like Mr. Toad ("Wind in the Willows") recklessly and happily, gathering speeding citations as I go. Yes, yes, yes!
What's that on the rear fender - a cop detector?
Ads in the Post indicate the Washington Savings Bank was located at 10th and Grant Place N.W. I think Grant Place is now called 'G Place N.W.' Anyone know for sure?
In any case, I've added this photo to the growing list of Google Mapped Locations of Shorpy photos in the district.
This looks like it may be a custom roadster body, not stock. Interesting that the door has rounded corners but the body opening is squared off.
[Plus, concealed hinges. Pretty fancy for 1920. - Dave]