That looks like the real deal and is worth money. You are correct that it is not for the 190 SL, correct style starting in 1959, but the 190 SL ones were ivory with saddle corners and straps. A full 7 piece set of 190 SL Hepco luggage, if you could find it, could be worth 20-30K, I'd guess.
Depending on the size of this piece, which is correct for a 113, I'd guess several hundred to over $1000. Put it on Ebay and see how high the bids go.