I've just been given another A500...
This one's interesting though, because it has a red power light.

"Aha!", you cry, "That's because it's an early A500!".
However, this one (serial number 522315) has an ECS Agnus and 1MB chip RAM (in the trapdoor slot, natch).

I always though the power light turned green before the ECS chipset was introduced! Not here though!

Incidentally, the warranty seals are both in tact!

Interesting, huh?

Edit: Oh, incidentally, the power light doesn't turn off when the filter goes off, it goes dim, as you'd expect.