The Aladdin model B "treasure" lamp was in production from 1937 through 1953 , except for the WWII years.

Before 1949 (with Chicago model B burner):

B-136 Chrome plated (1937 & 1938 only)
B-137 Oxidized bronze
B-138 Nickel plated

1949 and later (with Nashville model B burner):

B-137 Bronzetone paint finish
B-138 Nickeltone paint finish

 

1940 catalogue (pdf)

1946 catalogue (pdf)

1951 Catalogue (pdf)

The "Treasure" lamp did not appear in the 1954 catalogue

The 1949 Aladdin model B Nashville Treasure lamp was made to commemorate Aladdin's move the Nashville. This lamp is a factory hybrid in that it is made of a Treasure bowl mated to a model 12 foot.

1949 was a year of many changes. Aladdin headquarters moved to Nashville, the labeling on the model B burner changed from "Chicago" to Nashville", treaded inserts for the burner in the top of the fonts were replaced with a single formed thread and the fonts were painted instead of plated. This commemorative lamp is a fine example of those changes.

Aladdin made an electric version of this lamp from 1949 through 1953. The electric version, catalog M-251, used a polished brass Nashville Treasure font with an electric burner. The electric cord exited the lamp through a slot in the base. These lamps are a lot more common than the kerosene Nashville Treasure and some people have created their own Nashville Treasure lamp by placing a bronze plated Nashville B burner on a M-251 font that has been painted brown. Genuine Nashville Treasure lamps and good fakes have the identical "Bronzetone" paint as the 1949 - 1953 bronze font lamps.

B-137 is the bronzetone painted lamp with bronze plated burner

B-138 is the nickeltone painted lamp with nickel plated burner.

B-139 The earliest lamps were bronze plated before bronzetone was introduced.

These lamps were usually offered with 14 inch paper shades or without a shade. There were also offered  with the 701 style glass shade for people who wanted a glass shade.

The Nashville Treasure lamp is painted the identical Bronzetone as is the 1949 - 1953 Bronze model B font lamps. If the finish id not identical the lamp is likely a M-251 electric lamp modified to look like the less common factory Nashville Treasure lamp.

Model B thread insert used on metal font lamps before 1949

Nashville model B thread was a single thread stamped into the lamp top as did brass model B font lamps made between 1949 and 1953.