Nice older one, also seems to be made before they added the "long life" to the model name. I think I've got some 15W from 1995 with the same etch.

Cool, a proper quality one!, it has Osrams original ‘Interna 41’ colour code!

Beta 5: I love the advertising for the use of the electronic ballast as it was to entice ppl to switchover to CFL but have been put off by the flicker and buzz of the magnetic ballasted SLs. The high frequency electronic ballast was the innovative selling point as well as the more compact size. I got other copies of the 20w DULUX ELs but they all have LONGLIFE advertising on them. @Angryhorse: ah yes totally proper they are and the 2700K light is rly nice compared to other CFLs that cast a too yellow tint