Hello Glass Message Board members and thanks for your help in the past.
I have a black glass duck which I originally thought was manufactured by Sowerby as it has a small indistinct part mark to base which I guessed was their swan mark. Now not sure as the Sowerby duck photo I have is different to my black duck - is much deeper in body and has a shorter neck. My duck if 5 1/4 inches wide, beak to tail tip and 2 inches high at top of head.
Could you ID manufacturer and date (if possible) for me. Thanks, Keencollector.