What you have here is a nice gen-2.3 HPI lamp with 3-piece barrel burner, made in April 1980. It's a classic, and you can read more about it there and there.

Thanks for the info !

I should take a picture of mine too...
Thanks for the info Max!

No problem, Erik. Did you light up your HPI/T? It's possible that it won't have any problem igniting at the relatively high open-circuit voltage of your mercury and metal halide transformer ballasts.

No, I haven't. Didn't think this would work on an M59, let alone an H33, being that it doesn't have a starting probe.

Max is a useful bloke to know.!

Glad to be of service, Sammi

Erik - The lamp is filled with a neon-argon Penning mixture that is very easy to ionize. In my experience new HPI/T lamps can start at mains voltage (230 V in Europe) due to the lack of free iodine and hydrogen iodide in their burner, so you should be able to start your (new) lamp on your American ballasts. However, results may vary between batches, so that's no hard guarantee and there may be some delay in the starting process, so be patient if it doesn't start immediately. You want to use the higher OCV from a M59 ballast for a more effective result. If the lamp doesn't start (it may happen), then use an external source of weak HV (such as a BBQ ignitor) to help the process.

Let us know (with pictures preferably) what you think of the light color. The NTI fill chemistry was the very first one employed by GE in its very first MH lamps.