Reverso auction results - what am I missing?

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I followed an auction today in the UK that had 2 Reverso’s up for sale.

One caught my eye as it had an early, well preserved, black dial stamped “Reverso”.

The other one was later or had a later service dial, but to me wasn’t particularly interesting.

The black dial hammered at £4000
But the other one hammered for £5000

What am I missing?