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The 1861 Moonwatch was replaced by the 3861 (Master Chronometer) model in January '21 (maybe details were leaked in late '20), and the various 1861-based models were discontinued (so there might have been a minor rush to grab a 1861 before they became unavailable). Also Omega took the opportunity to hike the base price of the Moonwatch by (IIRC) about a grand and a half. When a brand does that it tends to drag the prices of the "equivalent" pre-owned models up with it.
Looking at the watch value chart in Chrono24 and for my Submariner it’s a steady, basically linear rise.
By contrast the Speedmaster chart shows exponential growth in late 2020, which then levelled off and now it’s nosing over a bit.
Was there a particular article or event in late 2020?