There were quite a few of the low-profile PCR type sights on the railed models back around 2000-2002 during the introductory period of the railed D Compact model. Some came in as surplus pistol sales a couple years ago. Don?t think those used the P-01 roll mark on the slide. CZUB...mixing and matching as always 
Finally some light is shed on the surplus Compact model I bought a few years back.
Apparently it was a Czech police surplus ('02 build date) that was imported by Century Arms International.
I have yet to run into another one like mine in the wild.
It has '75D Compact' stamped on the slide, PCR sights & rail, but no loaded chamber indicator.
I had it cerakoted as it had substantial wear on the finish.
Here's a pic of it.
