Both my 312 and 512 came with the same grey wound (ie: non-SIS) cable housing on the RD. For that matter, so did my Centurion Ironman of the same timeframe. All three were Shimano index shifting.
FWIW, when I re-built the 512 I replaced this housing with SIS, just to play it safe.
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You know it's going to be a good day when the stem and seatpost come right out.
(looking for a picture and not seeing it? Thank the Photobucket fiasco.PM me and I'll link it up.)