Waltham 8 Day clock used in Hudson

Unknown

My uncle has a Waltham 8 Day clock used in a Hudson Super Six Series. From the

pictures he sent me it is about 3 inches round, 3 and 1 half inches with winder. It has

an upside down triangle pointing to where the six is. It reads Husdon Super Six in the

triangle. I was wondering if anyone knows what year this is from? We believe is it from

1916 to 1927. He would like to have any literature about it if you know of any. It is in

very good condition and keeps good time. I have also been trying to find some kind

of price guide that might give an insight to it's value. Thank you for help.