Thanks for the info, all my machines must be pre-WWI as they do not have plywood cases? However now I'm really confused about the two machines were the horn is removable and is brass (bronze?) casting and was obviously not plated. The material appears to be the same brass casting material used on the top of the coin tubes.
The Brass cornucopia may have a clear lacquer finish over it as when I took for a very quick hit against the buffing wheel there was almost no change so I'm guessing I'd have to burn through the coating first.
Also you mentioned that the top edge of the casting was not gold tinted? At least one of mine is tinted, the others appear to have been painted yellow or blue.
It almost seems as if the painting style was done based upon who painted them that day or what paint they had on hand.
Attached are pictures of some of the machines and some detail of the top casting or cornucopia.
Edit: links to the pictures for some reason they wouldn't upload..
<- Future pay with brass cornucopia
<- Skill stops with brass cornucopia
<- coin front every polishable appears to be gold tinted
<- including the top casting
<- cornucopia casting brass frontside
<- cornucopia casting backside