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.../... these unique round orange lamps were not M-B units at all but rather Italian sourced and dealer fitted .../...
So, if the Italian side lamps were fitted at the factory, what should one expect to find on the data card: the "543" country code for Italy, the "620" or "SA620" option code for Italian Version, or both?
The side indicator lamps certainly are Italian type (same as fitted to Fiat etc.). However, in this case the M-B factory seems to have bought in the lamp units, and they were fitted in the factory on cars with SA620(version for Italy). The electrical feed is very nicely integrated in the wiring loom of the SL.You can see these lights fitted onto the second (white) SL in the well-known factory photo
I would expect to see the 543 for Italy and the 615 for additional turn signal for Italy