I have 3 of these clocks, all six inch dials, two are mechanical Chelsea clocks - one with just red, one with red and green, and one quartz clock near the entrance of my home - the quartz is the most accurate, least costly to maintain (one AA cell every year), replacement quartz movement is about $10.00.

I have a Chelsea mechanical radio room clock in a Chelsea push button opening brass case sitting on my dresser in a Chelsea mahogany stand.  You see them rarely here: https://www.chelseaclock.com/style/vintage-clocks-collection

The quartz versions are available in the standard 6 inch size and the 8.5 inch size here: https://www.chelseaclock.com/style/patriot-collection

Sign up for email notifications, they have at least two sales a year for 20% off.

Mechanical clocks are costly but collectors love them.  You can end spending nearly the price of a quartz clock in maintaining your mechanical clock if you're not lucky, on the other hand, I have a deck clock that I picked up in Taiwan at a fellow's shop who is know to deal fairly with seamen and bought it for $50.00 USD and it is within 15 seconds a month and it's been that way for 35 years that I've had it.

73

DR