I bought these Beyerdynamic Dt880 recently and I only realized that they are different to the ones on Beyerdynamic website.
Are these an older model?
That's a DT880 Pro headband by the looks of it. Pro - not Premium.
It says on the cups whether they're Pro or Premium (Pros are labeled as Pros). Did you buy them new or second hand?
Interesting - the cups definitely look like the newer (2005) shape. Haven't seen many of the blue outers before. Maybe Manufaktur edition? If you're unsure, and want clarification, just send an email with a photo to Beyerdynamic. They should be able to answer any questions you have.
Beyerdynamic has replied my email saying that these are a China market special edition. The reason they gave for mine having the Pro's headband is the climate of south China. The Premiums leather headband tends to get sticky after 2 years due to the hot and humid climate.
Do you use a headphone amplifier with them?
They are only 32-Ohm, but are a little harder to drive then typical 32-Ohm cans.