My first watch i had purchased

My first purchase in my late teens when I was in the service.  Citizen 7878 an eco-drive before it was eco-drive it was solar tech.  Never serviced or polished.   This thing is solid until the battery/ capacitor failed.  Just in my collection.  Maby one day ill have it serviced. 

Friends tell me this is a hard to find model these days.  I dont know anything the current desirability about this model.  Had it so long just can't part with it now.