Would you consider purchasing ?

Channeling the defunct Romain Jerome theme......tacky at best. And way overpriced.

UK prison system must be very comfortable, allowing a murderer to wear a solid gold watch while incarcerated. The Blues Brothers (Jake and Elwood) should have been so lucky.

As a riposte on the aesthetics, this is worthy of that scholarship at All Souls.
But on the OP's - I am assuming, here - implied other question, I speculate that hardly any non-Brit members will immediately have any name-recognition to guide them on this. I am very happy indeed about that, and I wish we could all join them. Sorry to sound such a prune (sic), but there are so many better uses for such a sum, watches or otherwise. Glad OP raised it: didn't realise quite how strongly I'd react! Let the tides of time close over the whole lot.

One of the few candidates that would look better after being over polished and turned into a bar of soap.

I assumed 'imprisoned' meant prison.

When I was in high school, I worked at a psychiatric hospital one summer on the housekeeping staff. This meant cleaning toilets, mopping floors, cleaning windows, polishing floors with a floor polisher (those things will take your leg off if you are not careful). It was a facility that opened in the 1940 era, and housed as many as 2400 patients. Massive facility on over 400 acres of land.

We had a medium security forensic ward. After taking the mandatory self-defense course, I was on my orientation day with my supervisor, who took me to that ward. Patients were allowed out in an enclosed yard for 1 hour per day to essentially walk in circles, and the rest of the time they were in their rooms. The people who had just been transferred from the maximum security facility were shackled - ankles together, hands together, and all tied to the waist. The cuffs were painted bright orange, and that denoted a very recent transfer.

There were all kinds of people there - one he pointed to had killed their spouse with an axe. This was medium security, but it was much like a prison. This was early 80's, so a while ago, and the facility is now closed. My shift was from 4 PM to 1 AM. Low risk patients were out and able to wander around until 8 PM. I recall being in a fairly remote area of the facility one night cleaning windows, and the screams of patients were pretty unsettling. It was an interesting summer job, to say the least.