Six weeks on from the above and I'm still searching. There were a couple of brief moments of excitement during Nov, firstly when a used black/black '76 with road wear turned up on Reverb. But it was a manufactured a couple of weeks before mine according to the serial. Also, The Bass Gallery in London had listed a used Jetglo '76 with a non-original bridge pickup. TBG are located just a couple of miles from my old apartment, so I was immediately intrigued. A quick trip up there confirmed it wasn't the one, unfortunately.
I did receive some information that has eliminated some of the uncertainty about the ex-partner/sibling situation though, which has allowed me to disregard that. It turned out to have been a case of poor communication.
So, I’m still no closer to finding the guitar and the person who sold it in 1995 has nothing else useful to add. In the meantime, there are threads running on all the major Facebook Rickenbacker groups and other Ricky or bass related sites like this one and alerts are set up on Reverb, Ebay and Gumtree (the UK's equivalent of Craigslist). I guess its going to be a waiting game now, not sure what else to do.
In the meantime, here’s a pic of my manservant giving it a quick tune up back in 1992.
