metal ID Tag on a vintage Streamliner what does the info mean. I'm buying it, HELP

[jukeboxmick]

Hi guys I took the plunge and I'm buying a late 1960's or early 1970's
Streamliner Empress looks to be a 29 footer with the Imperial upgrade package. There's a tag on the side of this trailer. I'm not sure what the info means. Is there anyone out there that can translate what the tag I'd info means

in the M box is has the number 71
does that mean I have a 1971
Streamliner

in the S box it has the number 2503
Note sure what the means.

in the 3rd box it has the number
5336 is this the gross weight of the trailer

In the A box it has the numbers
489269 is this the vin number

here is a link to the picture of the ID plate maybe someone can school me

http://i13.photobucket.com/albums/a276/vintagecoinopclassics/vintage%20trailer/4ACBAA61-A1CA-40BE-A3C9-B9CCC2B8D1E6.jpg

This trailer is nice cosmetically, but the floor is bad inside but it has all original components except the refrigerator, So all cabinets and kitchen stuff is there along with stand up shower and sink and toilet.

it's been sitting in one place for 25 years so not much travel on this one.
tires inflate and hold air.

here is some other pictures of it

http://i13.photobucket.com/albums/a276/vintagecoinopclassics/vintage%20trailer/38AAE836-0F1A-43E5-AA03-CB693DE51355.jpg

http://i13.photobucket.com/albums/a276/vintagecoinopclassics/vintage%20trailer/AD0A1573-E9DF-4553-B517-A855BE65234D.jpg


http://i13.photobucket.com/albums/a276/vintagecoinopclassics/vintage%20trailer/3868A3A5-6428-45BC-8144-E6840DB98E65.png


Thanks in advance for your help

here is a short YouTube video of the trailer so you can see a lot more
and the insides

http://youtu.be/oFlo1rJVbwU


Mickey