The trend in classics seems to be "barn finds" and "dust buckets" that haven't run in years, which still bring big money even though they've been sitting neglected for 4 decades or better.

At 40 years old, and perhaps the most-appealing of the 107s (save for maybe a pristine 560), I can't imagine you'd go wrong parking it for a decade, and then re-listing it. It shouldn't even take that long for the economy to improve, which means you'd still get more money for it 3/5/7 years from now or more, than today.

I'd mothball it for a better day

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former: 83 300D, 97 C230, 93 400E

current: 08 C300 Luxury , 92 500SL