Hi,
First time poster here.
This is not a Big Block. It is the Chrono model that followed the last Big Block models ref. 791x0.
As some people have mentioned, Big Blocks case is chunkier and sides are flat. Also BiG Blocks have plexiglass crystals. As opposed to sapphire in the 792x0 chronos.
Your watch is very nice though and certainly have increased in price considerably. They are not as coveted as Big Blocks though.
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