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Need help with this OSRAM light bulb...

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Faneco:
Hello to the forum
Could someone identify this OSRAM light bulb 215v 80w? Links to the images bellow.
Thank you in advance for any help given.
Pedro

Links:
https://s1.postimg.org/1uk9g46t4v/DSC_4372.jpg
https://s1.postimg.org/4t9axs6shb/DSC_4373.jpg
https://s1.postimg.org/91bqtgaob3/DSC_4374.jpg
https://s1.postimg.org/94vcr646gf/DSC_4375.jpg
https://s1.postimg.org/40jo1w3ecv/DSC_4377.jpg
https://s1.postimg.org/2u0ctadmwf/DSC_4378.jpg

Faneco:
Anyone, please?

Tim:
The packaging looks modern but the design is old (drawn tungsten cage filament), so I'm a bit confused, not to mention the odd vacuum tube / valve-like 4-pin base.  Sorry, I don't have an answer on this one.  Maybe someone else will recognize it.  Interesting bulb though!

Faneco:

--- Quote from: Tim on November 01, 2017, 09:21:47 pm ---The packaging looks modern but the design is old (drawn tungsten cage filament), so I'm a bit confused, not to mention the odd vacuum tube / valve-like 4-pin base.  Sorry, I don't have an answer on this one.  Maybe someone else will recognize it.  Interesting bulb though!

--- End quote ---

Hello
Thank you for your reply.
The packging is the original of this bulb, as i have a good quantity of them and all have this kind of packaging.
About the bulb itself, don't know a thing about it.
Don't you have an ideia of where it would be used?
Thank you again for your help!!
Pedro

Chris W. Millinship:
Those are/were, as far as I recall, navigation light lamps for ships. The use of a straight cage filament was to give it more mechanical resistance against vibration in use - many more mechanical supports inside than a regular coiled type which provide better protection. The valve type base has connections to the filament in different sections either to allow dimming by switching more or less of the filament in and out, or possibly to allow operation on different voltages depending on operation of the ship. The HM Government franking suggests military operation - they`re probably from Navy ships. Unfortunately I`m struggling with the date code so can`t say when it was produced - doesn`t seem the usual Osram format unless I`m reading it wrong.

Hope my memory hasn`t failed (as it so often does!) and that this is of use.

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