If you're not sure which version you have, you can measure the exterior of your grouphead piston cylinder. The PRE-Millennium is 50mm; Millennium is 60mm.
https://www.espressocare.com/la-pavoni-millennium-or-pre-millennium-comparison
That's a very handy measurement to tell the difference, I always relied on the 49mm vs 51mm basket size, but that grouphead one is much more obvious.
@mmccarthy started
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If you're not sure which version you have, you can measure the exterior of your grouphead piston cylinder. The PRE-Millennium is 50mm; Millennium is 60mm.
https://www.espressocare.com/la-pavoni-millennium-or-pre-millennium-comparison