This is a Bandmaster extension cabinet. It has two electro voice SRO/12L speakers. This speakers can sell for $200 each. You can check these prices out on Reberb. This is vintage 1970s equipment. I bought the cabinet in 1975 and replaced the speakers. The speakers are in excellent condition. This is from chatGPT:
1. Original Cones: Original EVM or Electro-Voice cones are more desirable than reconed units.
2. Functional Testing: Resistance check (~8Ω), no voice coil rub, full-range audio test.
3. T121 Matching Code: Some were OEM for Fender or Sunn amps and are more desirable.
4. Frame Style: Aluminum cast frame (older) is preferred over some later stamped versions.
5. Magnet Type: 12L has a heavy ceramic magnet, which collectors prefer over ferrite clones.