Without a take-down lever, it may not be a true Tellbuschse, but I usually only refer to a tip-down single of the early variety as a Tell. It would then possibly be a Modell 36 or 37 Pirschbuchsen or Kipplaufbuchsen(tip down barrel). This could be a mute point and they both are one in the same. Is there a serial number, say 120000, on the left side of the barrel lug or on the frame. The screw between the triggers is the set screw for the German stecher or set trigger.

Kind Regards,

Raimey
rse