Your coffee urn looks similar to this one from Invaluable.com:
Lot 655: Two Silver Finished Coffee Urns and One T.J. Topper Coffeehouse Urn
Photo 3 description: "Filed with the patent office in 1929, Thomas Topper designed an adjustable water feed system for coffee making, eliminating the need for an attendant to manually control the flow of water, allowing the operator to dial in the quantity of the coffee desired, with the machine handling the rest. Measuring 41" tall on a set of legs and roughly 18 inches wide, with external feeds for water and gas, a maintenance port for access to the heating elements, the water control valve (graduated from 1 to 6 gallons), a 15 1/2 inch tall glass gauge and a pair of spigots, also set up for gauges. The water control knob is marked as "PATENT PENDING", indicating early production."
Looks like the auction was in 2009, but it says you need an account to find out the price data. You can
create an account here.
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This is one of the patents on your urn:
US D59135 S
Here are other patents I found under T.J. Topper's name:
US 1468527 A,
US 1601987 A,
US 1840985 A
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On Feb 29, 2012, I believe
a similar one was sold on Ebay. The pictures are no longer there. It was sold for $1,250.
Here is the description on Ebay:
Offered here is an ANTIQUE RESTAURANT COFFEE TEA MAKER/URN!
Made by T.J. Topper Co., San Francisco
Made of mixed metals
Wood handles
From the condition of the interior, it appears that this unit was lightly or never used
Original "hook up tag" for gas burner
Metal is pitted from storage
Includes original "coffee baskets"
Missing one sight glass protection rod
#20078
HTH!
Angela