CR
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It worked!
Not that it shouldn't, but there's always that question at the end of February!
Below are pics of a Langematik Perpetual (310.025) taken (1) at 2208 hours on 28FEB18, and (2) about 12 hours later at 1021 hours on 01MAR18. I really love the combination of the newer (brighter silver metallic) rhodium dial with the older (protruding rectangular) pushbutton. The older dial (duller matte finish with a slightly pink hue) and recessed pushbutton are less preferable features for my tastes, though others really like the earlier dial and the recessed pushbutton. Aesthetically, I actually do prefer the recessed pushbutton on the newer pieces. But because I don't keep the watch on a winder, I need to use that pushbutton a lot, so I'm glad I can use my finger rather than a toothpick to advance all functions by 1 day with each push of the "genius button." So functionally, the old-school protruding pushbutton fits my usage habits much better.
[I wish I could take similar pics of the FP Journe Octa Perpetuelle, but it's being serviced by FPJ now, just as it was being serviced during leap year in 2016. But at least I got to see it work one year, at the end of February 2017! 
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Complications
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Review
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It worked!
Not that it shouldn't, but there's always that question at the end of February! Below are pics of a Langematik Perpetual (310.025) taken (1) at 2208 hours on 28FEB18, and (2) about 12 hours later at 1021 hours on 01MAR18. I really love the combination of ...
Love that watch......
It is one of my favorite perpetual's out there really in any metal but particularly in platinum. Looks like you have a bunch of nice Lange's Craig! In any event, I thought about changing to one of my perpetual's last night but figured it was pointless as ...
I love Lange because, besides all the features available, the big date is the only one really useful
Patek in line windows calendar is the only competitor I like
People like or not this “Lange detail” but the fact to not display a “0” when the date if before 10 is something I like a lot
Regarding this specific model, I like it too but I have one concern about it. When you closely pay attention to the “AUG” and “JUN” month writings, you can notice, on few models, a “gap”. Something I don’t understand coming from Lange. Without this potent...
Yes.
There's also a misalignment with the "JU" of June. They do balance each other. Not sure why that has happened.
Here's what I think...
It might have been deliberate. If the "UG" (in AUG) and "JU" (in JUN) were lower on the leap year subdial, they would practically touch the year numbers "1" and "4." That would look even worse. The only way to make everything line up perfectly would be to...
It's definitely not (only) the earlier dials, because my dial is a recent replacement dial of the newer type. Also, have a look at these non-English dials...
... that were posted here 15 years ago: ...
It makes it look like the leap year subdial is under a magnifying lens. Similar to the Rolex date.
So a special effect by design?
This is the less surprising post of the year LOL.
I don't know why but I was sure that your Langematik would handle this month change. Thanks for the nice pics! Fx
One of my favs!
I don't own one but it's something I would one day like to purchase. Glad it worked!