sold in US and UK 1920 into 1922

The Aladdin model 9 lamp introduced entirely new fonts while retaining a slightly refined version of the model 7 burner and model 8 wick raiser. This design carried through models 10 and 11 with a few variations.

The burner base and outer wick tube used on models 9, 10 and 11 remained the same as the model 7 and 8 burners. The model 8 wick raiser was also used unchanged. There were minor changes to the construction of the flame spreader and gallery from the earlier lamps.

The model 9 was in production for two years and was sold concurrently with the model 10 during the second year.

There are two versions of the model 9 lamp. The early version has the model 9 designation below the diagonal Aladdin logo on the wick raiser knob and the table font has a wide flat bottom flange in the model 6 style.

The late model 9 version, like the models 10 and 11 have the model designation over the diagonal Aladdin name and a table font that has a narrower crimped foot flange.

The early model 9 used the same mini wick holder that was used on the model 8. The mini wick holder disappeared with the introduction of the reinforced wick that has built in mounting tabs. This appears to be around or just a little before the time when the model 10 was introduced.

The model 10 and 11 lamps are basically identical in design to the late model 9 making them essentially marketing "upgrades" and not technology upgrades.

I would guess that the early model 9 style was in production during the first year and the late style was in production during the second year when model 10 was concurrently produced.

Brass model 9 London wick raiser knob

Except for the numbers on the flame spreader and the wick raiser knob this picture could be for the models 10 and 11 as well.

If you compare this picture with the model 7 & 8 burner picture you will see the same burner design with minor construction variations was in production from 1917 through 1928. This was a very successful design for Aladdin.

Model 9 flame spreader

Model 9 outer wick tube. This design was used for model 7 through 11 (Some model 10 outer wick tubes had different construction). Note the outer air distributor and top flanges are separate parts held onto the outer wick tube with punch dimples

Wick raiser and mini wick holder used on the early model 9 and the model 8 lamps. When the reinforced wick was introduced for both the model 9 and 10 the wick holder became a thing of the past. The model 8 wick raiser was used through model 11.

The wick riser on the left was used in models 8 through 11. The one on the right is a model 12 wick. It can be difficult to tell which is which when you only have one to look at. I find it easier to think of the early riser tooth rack as being fine tooth and the model 12 as being course tooth.

The gallery on the left is for models 7 and 8. The nickel plated one on the right is for models 9 through 11. Other than plating the way to tell them apart is to look at the oval hole in the 'fingers'. The earlier gallery has a larger hole. The oval hole in the early gallery fingers are nominally 0.23" wide by 0.54" high, while the later gallery hole is nominally 0.18" wide and 0.5" high. The extra metal on the later gallery provides increased strength to the chimney retaining finders.