No there's no markings on the parts; I was able to tell slightly that the recoil spring guide was different because the top was a lot flatter (which prompted me to measure/compare).
The hammer spring is impossible to tell until you compare, I only noticed when I was about to swap it for a Guarder 150%. I actually ended up preferring the feel of the new stock spring.
I also noticed a small extra detail on the MEU, in addition to the markings on the slide and receiver, they also added Novak trademarks on the rear sight. I just ordered a few parts from eHobby to make it 100% genuine (or as close as possible, given that MEU 1911s vary slightly by batch). And I'll have to add a rollover notch on the slide.
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