This rare speaker is late 1965 T1221 G12M first year of G12M model! With Celestion factory recone made in 1970 with 55HZ pulsonic cone(making it a T1511 model), details can be understood by the RW factory recone stamp(with date to match the recone date), and mid 60's type of chassis, with original 1965 type of sticker parts still visible under the green cover, see pics for details. Cone is absolutely flawless and the speaker works and sounds perfect.I also have another single of this model and a pair listed, QUAD AVAILABLE. Check out my other rare loudspeakers by clicking here. The item "RARE 1965 Celestion G12M T1511 T1221 Greenback 12 loudspeaker Vintage Pulsonic" is in sale since Wednesday, February 10, 2021. This item is in the category "Musikinstrumente\Vintage Musikinstrumente\Vintage Gitarren & Bässe\Verstärker". The seller is "vintage-ride" and is located in Helsinki. This item can be shipped to all countries in continental Asia, United States, European Union member countries, Canada, Australia, Switzerland.