The burner that isn't marked does t seem to work properly when you turn one of the dials it It doesn't raise and lower the wick like it should do - so that burner will need attention - either repaired or maybe it would be better to replace so that they both match. Width across the arms is 41cm. It's quite a large size with the central brass post measuring 64cm / 25 inches tall. The arms can be raised and lowered so you can have it with the arms either raised high or down low. I like it in the position I have photographed.
In this position it measures 30 from base to top of glass chimneys. If you set the arms higher it would be even taller. It did clean the brass a little - but it could polish up a lot higher if desired.