Hey Charles, good eye there, that got you an R390A. Yes, yours would be lovingly known as a "mongrel," having seen the repair depot maybe more than a few times over the years. The bench guy would swap modules to quickly get the radio back in service, then later fix the problematic module for the next recipient. So, you've got a composite among all the contractors that made the R390A. By contrast, comparisons to the AKC has led to the nickname "purebred" for examples that have all the modules from the same manufacturer. No big deal, functionally, but sometimes it can indicate the kind of life the radio has had. The Cosmos PTO, in my experience, is just as good as the Collins once it's aligned and taken care of.