Gazelle? Does anyone know anything about them?

Yep, looks like seller was simply unaware. Understandable if you're not as much of a Gazelle anorak as some of us and you don't have a similarly sized frame in 653 to weigh and compare against.

Looking at the number of transactions and his sold items, I think the seller is quite experienced, also in misleading titles, check out his 'Rossin' frame for sale...