Ultra-ultra-ultra rare.
Received not only a Coty award but the Golden Sound distinction for 1993 ! Quite a few other awards, too, but as for many other superlative Sony units, nobody knows about it.

The drive took on a very old idea: the Fixed Pickup Mechanism - introduced by Sony in... 1982 in the first commercially available CD player (CDP-5000), reintroduced here and later in 1994 with the CDP-XA7ES and CDP-X5000 and later again in the SCD-1 and SCD-777ES. Sony's original Twin Link System was retained, albeit in an "S" version I know nothing about. The D/A unit uses the little aluminium modules that would be part of the "1" series in 1999 (TA-E1, TA-N1 etc) and Sony's own D/A chips.

Production run is anybody's guess - probably no more than 100 of each? At 2,000,000 for the combo, Sony made these as showpieces for CD's 10th anniversary, available on order only. The CDP and DAS-R10 thus did not put to oblivion the previous CDP-R1a and DAS-R1a and both combos remained available together for a couple of years.
Click the two right images for more about each unit !

Btw, Sony's CDPs were extremely well ranked by Stereo Sound that year - 1993, or: the last full year of the classic ES line. Have a look:

CDP-R10 + DAS-R10 #1
CDP-R10 #1
DAS-R10 #4
CDP-R1a + DAS-R1a #8
CDP-R1a #11
DAS-R1a #10
CDP-R3 #11
CDP-777ESJ #5
CDP-555ESJ #1

...not to mention the TA-ER1 preamp (#1), TA-NR10 power-amp (#1), its TA-NR1 original version (#10) or the affordable TA-F555ESJ integrated (#1, aka TA-F808ES) and its smaller sibling TA-F333ESJ (#6, aka TA-F707ES) ... Quite impressive indeed for a brand that, as the saying goes, only makes portable gadgets !