There has only ever been one generation of the Amp.

Now if you are talking about the Connect:Amp, that had a Gen 1 and a Gen 2. These are only available on the used market as were discontinued long ago.

Always good to check as far too many places will happily unload an older version of whatever they are selling on the unwary.

I got burned by that on my first Sonos purchase and it caused me major grief with Sonos Support until I provided the receipts to prove I wasn’t trying to scam them on the warranty for gear that was well over a year old BEFORE I bought it.