A dual crown fork with black stanchions is a very basic description and I don't think that it'll be of much help getting your fork identified.
A few photos of the fork might help to identify it, otherwise you'll only get guesses of what it is. If it is a 888 then it could be one of around 20 different models spanning over 5 years, have a look on the Marzocchi website, they have photos and brief descriptions of forks dating back to 2001.
http://www.marzocchi.com/Template/detailHomePage.asp?LN=UK&idC=-1&IDFolder=122
The answers saying that it must be a 888 if it's a Marzocchi and has a dual crown are wrong, the 888's aren't the only dual crown fork that Marzocchi made, doesn't anyone remember the Junior T, Super T, Monster T, Super Monster, Shiver DC and Drop Off Triple. Some models of these forks also had black stanchions as well.
*EDIT* For baldbaddy or whatever your name is, I'm so sorry for upsetting you questioning your great knowledge and I'm sure you didn't really mean it when you called me those names, anyhow read on and you might learn something:
Aftermarket Marzocchi Dual Crowns Forks that had Black Stanctions.
2004: 888-R, Junior T, Super T Pro.
2005: 888-RC, 888-VF, Junior T, Shiver DC.
2006: 888-RC2X, 888-V2F, Junior T, Drop Off Triple(OEM).
2007: 888-RC2X, 888-RCV, 888-SL-ATA, Super T RCV.
2008: 888-RC3, 888-RCV.
2009: 888-RC3, 888-RCV.
2010: 888-RC3-EVO, 888-RCV.
* The 2005 Shiver DC might be an inverted fork but it still has black stanctions & dual crowns.
* There's a few more forks that were OEM models which could be added as well.
* There's only 2 models I had previously mentioned that didn't have black stanctions at some time or another, the Monster T and the Super Monster and I mentioned all those forks before the "Asker" added that the fork has black stanchions .
* The 1st paragraph is a later addition that was added after the info on black stanchions was added as is the last sentence of the 3rd paragraph.
* You say some of the forks I mentioned have a bolt on M cross support/arch, silver screws and red M's, how do you know the fork doesn't have these things, have you actually seen it? has anyone actually said that it doesn't?
* At least I've provided a useful link where the 'Asker' can view photos and read descriptions many Marzocchi forks from different years.