The fabric is falling apart in back, but Lycra wouldn't be here at all in 40 years
Front
http://www.sebringsil.com/sw1.jpg
Rear:
http://www.sebringsil.com/sw2.jpg
Just for comparizon, here is a magenta Thong from Koalaswim.com. This is probably 10-12 years old and in great shape
http://www.sebringsil.com/sw3.jpg
And just for the fun of it, my new Seobean 40 years after the Janzen
http://www.sebringsil.com/sw4.jpg