Here's a couple of A. Haetge of Berlin examples which I guess to have been sourced from Teschner/Collath: http://www.littlegun.be/arme%20allemande/artisan%20g%20h/a%20haetge%20a%20gb.htm . I don't think it to be too terribly far from the Teschner/Collath factory to A. Haetge's Berlin retail outlet.

Kind Regards,

Raimey
rse