I found a clock insert on ebay that looks like it would fit into this clock so I resized the clock and carved a hole so that the clock insert would fit. My print bed is only 150x150x150 mm so I cut the clock into three pieces. The cutting is not great so you'll need supports and good gluing skills.

I took the model into meshmixer and tried to smooth and fix some of the clock. It looks slightly better.

Here's where to locate the clock insert on ebay: https://www.ebay.com/itm/2-1-2-65mm-QUARTZ-CLOCK-FIT-UP-Insert-Gold-Trim-Roman-Numeral-Easy-to-Use/302500496595?hash=item466e6f44d3:g:ruIAAOSwiQ9ZR0Ak

or search for "2-1/2" (65mm) QUARTZ CLOCK Insert, Gold Trim, Roman Numeral".

After printing, it might be good to finish it with primer and some sort of metallic paint.

I glued the pieces together will "Seal All" glue. I then sprayed it with Primer then with Shiny silver paint.