@rock_it_again,
This board, is not as active as some others like the Buying. Selling, Shipping ones, and you did post your question on a Holiday weekend. Some may have read it and are trying to do some research on the clock.
I do not have the time today to do much research, but you might try searching the different auction results sites, start by searching for "Disney, Mickey Mouse metal wall clock, (I found one by made in Taiwan currently listed on ebay) if no results appear, add 18" and if you still do not get results add made in Italy. Some may have sold but without the seller adding Home Video, Size or country of Mfr. to listings.
An advanced search of sold, completed listings returned lots of results for clocks of varying sizes types and country of Mfr.
Despite the collectible desirability of Disney items, since this was most likely a promotional item that video store owners would have had to buy, it was likely not purchased by them, because so many other companies issued free ones, and the ones that did buy them may have passed them down to family/friends like your Grandpa did. The clock may also have been bought more often in England or Australia by independent video Store owners. You can login to those sites with your U.S. username and password, to try searches or advanced searches on them.
Even though my quick ebay searches did turn up some Disney wall clocks the realized prices for them were not very high. Though most were smaller and made of plastic in Japan and Taiwan. That may be because most were available at Disney venues or in their online stores. Posting about the stores, just gave me the idea of searching for Walt Disney stores and there are some dedicated ones in various cities. Since there seems to be an item or Disney serial number on the clock's back if you contact some of the stores, you may be able to get some info from one of them whose owner is a collector. Good Luck
"THERE IS NO SUCH THING AS FOOLPROOF, BECAUSE FOOLS ARE SO DARNED INGENIOUS!" (unknown)
