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Philips 860w Allstart CMH
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Restore find, these CMH lamps are designed as energy saving retrofits for M47 1kW probe start and M141 1kW pulse start ballasts. Even though these run on probe start ballasts the arctube dosen't have a starting probe. I suspect it uses a special fill to allow it to start on a probe start ballast. Unfortunately while the rest of the AllStart CMH line is universal burn, the 860w one is vertical burn only so I guess we won't be seeing these in vintage 1kW MV cobras any time soon.
Another interesting thing about this lamp is that it's open rated, you can see the hefty quartz shroud and the wire guard around said shroud. I guess the 1kW lamps get quite err explosive at EOl.
Click here to see this lit up.
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@Mike, yeah I believe Philips makes a CMH retrofit lamp for all of the MH wattages. They run off probe start ballasts too so I guess you can turn any MH fixture to CMH now.