Concert (from Germany)
Thanks to Timothy Tikker for information about this German-made clarinet. It looks to me like a Buffet E-11.
Assuming this is a Buffet E-11, this is most likely produced by Schrieber, who is the main maker for non-French Buffet clarinets.
The "W. Germany" designation means that this MUST date to before 1990. The E-11 is a relatively new model (not like the R13 which dates to time immemorial), so this is probably a 1980s model.
Also assuming this is a rebranded Buffet E-11, this is going to be an excellent player. Most E-11s are excellent players and some of the best overall in their price point.
Key System: Boehm System
Brand Name: Concert
Place of Manufacture: West Germany
Approximate Date: 1980s (probably)
Body Material: Wood
Bore Type: unknown
Key Metal: chrome plated
Keywork Quality: probably pretty sturdy
Serial Number: 66929
Recommended For: intermediate
Value: up to $350