An image showing the alleged rear shell of the 4.7-inch iPhone 6 next to the same component for the 5.5-inch version has been leaked from a source “deep within Apple’s supply chain in China,” BestTechInfo reports. In case you’re wondering, the same publication previously published on YouTube a hands-on review of an actual backplate for the 4.7-inch model, and has posted similar YouTube videos last year showing back shells for 2013 iPhones before they became official, so it has a pretty decent track record.

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According to the source, only a few such 5.5-inch iPhone 6 shells are available in the factory where the photo (see below) was taken, which may be intended for testing only.

Furthermore, a September launch of the 5.5-inch iPhone 6 model is “unlikely,” the source revealed, which appears to be in line with the previously reported launch delays for the bigger model.

Various rumors have indicated that the 5.5-inch iPhone 6 has either been pushed back because of various production delays, or that Apple has decided not to launch the two devices together to prevent competition between them. The 5.5-inch phablet should head to production only in September alongside new iPad models, Taiwan’s Economic Daily News said recently.

Apple is expected to unveil the iPhone 6 on September 9, and launch at least one model in the weeks thereafter.

The leaked image showing the two iPhone 6 parts, along with a video discussing it, follow below.