Hi Denise,
Look at the history page on Airstream Central homepage: http://www.airstreamcentral.com/airhist.htm
. There are some informative bits there about model designations. According
to them, "International" is an option kit that includes an inline water
filter and slightly different trim, for those who may want to go south
of the border!
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Dan Burwinkel burwink@fuse.net