The clock itself maybe old. But the clock face could have been made as most recently as of yesterday!

There is a rash of these fake clocks floating around and have steadily increased in showing up in the last 15 years. 

I do not believe that you have a 1920s Winchester Store Era clock.

Just like a lot of these Winchester padlocks and other items. They are pure fantasy items.

Sincerely,

Maverick

P.S. This is my honest opinion of the piece and would be interested to see any evidence that proves the contrary.