Ryan, the model number appears to be a Gen3. However, only Buds has access to their used inventory and I would confirm before purchase at LiveChat (available from 9AM to 9PM 7 days a week), the "Blue Chat Button" at the bottom right of the page, or phoning at (859) 368-0371 (available 9AM to 9PM EST Monday through Friday).

the model number appears to be a Gen3. However, only Buds has access to their used inventory and I would confirm before purchase at LiveChat (available from 9AM to 9PM 7 days a week), the "Blue Chat Button" at the bottom right of the page, or phoning at (859) 368-0371 (available 9AM to 9PM EST Monday through Friday). we are not buds employees we are volunteers that answer questions

Hi Ryan, This is a Gen3 21SF