You have a C-Melody (like a tenor but keyed in C instead of Bb). The "L" means it is "low-pitched" meaning it tunes to A=440, though C-Mels have curious intonation, but that's the design intent anyhow. Depending on the condition, it could be worth anywhere from $100 (needs an overhaul and repad) to $500 (Minty, minty, minty...). They aren't generally in high demand, and the Wurlitzers are not as sought after as the straight necked Conns.