Saw this on ebay and was wondering if it's pulse start or not, it seems older, does anyone know?
https://www.ebay.com/itm/267042308170

I think it can. This is why:

If it is a probe start fixture, then yay you can just put in an MV bulb no problem.

If it is a pulse start fixture, then all you need to do is disconnect the ignitor (easy peasy) to be able to run MV. Both probe and pulse 400W MH have the same running specs as 400W MV (aside from the ignition voltages), so there is no problem with just disconnecting the ignitor and running an MV lamp.

Keep in mind that if it is a pulse start fixture, you cannot perform an ignitor delete to run a probe start metal halide lamp because they need a higher OCV. But MV should be totally fine.

As to your original question, the fixture does not have an ANSI code so I have no idea if it is probe or pulse, but either way you should be good to go for MV!

Here is my lamp spec spreadsheet with sources just in case you want to make extra sure:
https://docs.google.com/spreadsheets/d/e/2PACX-1vRyPSC_n1dhry8yQsygp1qXoub7YLaBoZcg-yZD2EY6nsw-XBSPN3IN666SN__ljA/pubhtml

Hope this helps
 

Thanks! It says ship date was in 2001 meaning its older, so hopefully probe start

if it comes with a lamp installed already, you could just look at the bulb to see if it is or not. Otherwise, you would need to open it up and look for an ignitor.

Yes. This luminaire was never available in 400W PSMH.