Right? Looks like the conversion done on 09/1992?ROTFL! Yeah, in spring 1992 when the M103 had one foot in the grave and the M104 production was ramping up as the new, improved replacement inline-cyl engine... MB/AMG were going to mass produce the 3.2L M103. NOT!
Is there any paperwork that corroborates the secret prototype claim? This sure looks like an MB employee purchase that was sent to AMG for some extra ponies (177hp stock, 230hp AMG).
Neat car, but rarity is not always synonymous with valuable...
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And by that time, R129 already was "300SL 24V" M104 fitted, at least for US market...