How do you tell which version Meridian 800 is?

I was given a Meridian 800 from a big audiophile friend of mine who has since upgraded to something better. While researching it I have found that there are four versions. v1 v2 v3 and v4. I'm fairly certain it's not a v4 just because of it's age. However I am trying to find out what it actually it. I have looked all around it for any give aways but cannot find any. Advice?
Contact Meridian directly give them the serial# and they can look it up and give mfgr date etc.