
The phone in the photos - which bears clear Apple markings - look almost identical to the one left in a Silicon Valley bar by Apple engineer Gray Powell during his birthday drinks in March, photos of which were later published on the US gadget website Gizmodo.
A YouTube video accompanying the write-up on one of the Vietnamese websites says the prototype was bought by a businessman from an unnamed source for $US4000.
If the new images prove to be authentic, and markings on the components of the disassembled phone appear to confirm the provenance, then it was mark another serious security breach for Apple.
The new 4G iPhone are due to ht the market in a few months. Apple is obsessive about keeping news about new products under wraps.
Last month Gizmodo pulled off a huge scoop when it posted photos of the new iPhone. It had been found in the bar and sold for $US5000 to Gizmodo, a gadget blog owned by Gawker Media.
According to Gizmodo, features of the new phone, expected to be unveiled later this year, include a front-facing video camera for video chat, a flash and an improved regular camera with a larger lens.
It also has a flat back instead of curved back, is thinner than the 3GS, is three grams heavier and has a battery that is 16 percent larger.