Yashica Y/C Standard Lenses

I wrote recently about a problem with a Yashica FX-3 Super. The mirror was hitting the back of my 60/2.8 S Planar. The consensus was that the mirror had slipped down a little. I will finally be bringing the camera to my repairman tomorrow. On the chance that the regular FX-3 has the same mirror and bracket as the FX-3 Super, I got a parts FX-3 to bring with me. The parts camera seems to be functional but I have not tested the meter yet. It came with the bottom half of a case and a 50mm f/2 marked DX. It looks just like the 50/2 ML. The only other Yashica (Yashinon) standard lenses I have with the DX marking are M42 lenses. Did Yashica use the DX marking on some Y/C mount standard lenses in markets outside of the U.S.? The plain FX-3 cameras seem more plentiful than the later FX-3 Super or the FX-3 Super 2000.

I believe Yashica/Contax mount Yashica lenses were almost all ML marked. I think I have a Yashica 50 that is marked DX but I don't know what that means.

I had the mirror slip on my Contax ST. Pretty simple to get it back in place.

Yashica SLR lenses from the screw mount M42 period are often Yashinon DS or DX (or DS-M). I don't know if there are substantive differences between the letter series.

Lenses from the early Y/C bayonet period, like contemporary with an FR I/II, are often marked DSB. I used to think that DSB came first and ML later, but https://camera-wiki.org/wiki/Contax/Yashica_lenses says it was a high/low price point difference rather than time. My limited experience at this late date is that some DSB lenses now suffer from sticky apertures.

The ML SLR lenses were more common later and the limited sample I've seen don't have the issues with apertures. The camera-wiki article names two DX lenses in bayonet mount.

In the early 1980s I got a Yashica FX-3 (pre-Super) as my first SLR. It was a starter SLR like the Pentax K1000, perhaps a less common choice, but it had a split-image RF and the K1000 did not yet. It came with an ML 50/2 and a little later I got a YUS 28mm and 135mm lens. The YUS lenses were at an inexpensive price-point, I am not sure if they were literally the DSB lenses repackaged. https://camera-wiki.org/wiki/YUS_135mm_f2.8