[A/S] Airstream model name hierarchy

["Lee Gilchrist" <LeeGilchrist@xxxxxxxxxxxxx>]

I have a 1975 29' A/S, center bath.

On the curbside exterior wall there is one plaque that says "Airstream 
International," and another that says "Land Yacht Ambassador."

My owners manual refers to Internationals and to Land Yachts.  In a chart 
of optional equipment weights Land Yachts are listed, ranging from 21' to 
25'.  Internationals are listed ranging from 27' to 31'.  

Can I assume from that that I have an "International"?  Of what significance 
is the designation "Land Yacht Ambassador"?  Is there more than one kind 
of Land Yacht, i.e., besides the Ambassador?  The naming conventions have 
me confused.

Thanks for any help.
Lee