The seller says that it's 2011, but it's the old style frame, so it must be older. Does anyone know when they switched over? The asking price is $1,000 and per the photos it appears to be in good condition. I really like the new Birdy that I test rode at b-fold, but the price is a bit steep. The seller doesn't know the model, but the derailleur is Deore. Thoughts? Thank you!