Determining original FBSD version

[jason]

Gerard Samuel wrote:

> I plan on making the move to 5.3 on boxes running 4.10
> via a fresh install.
> The thought came to me as to what was the original version of
> FreeBSD did I install on those boxes.
> Usually I upgrade the boxes via build/install world.
> If there is way to find out, that it would be interesting to know.
> If not, no big deal, as its an absent minded thought...
>
> Thanks
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I think all you can do is know what version you have now(uname -a).  
Other thatn that search for the oldest file on your computer.