I did see the article about the drop test and the sand test. Amazing to see what this weather-sealed Olypmus can take!

Is there serial no reference for the newer circuit board on the OM4?
It's $300 Cdn for the one I'm looking at. Externally it looks good and I was able to see the read out on the lower part of the viewfinder although it was a bit dim... Maybe there was a way to increase the brightness?

The winder was noticeably stiffer and not as smooth as the OM1n. Hoping, as mentioned, that's just the way things are built... To be more reliable.

What kind of battery life expected with the older circuitry? I've had my F3 die out on me so I know first hand that its important to carry spares.