One of the things I enjoy most about learning watch repair is buying vintage watch lots that you never quite know what you’ll find. Sometimes there’s an obvious gem, while other times there’s a watch that simply challenges my curiosity.

This vintage Felicia De Luxe Automatic was one of those watches.

The Felsa 4000N is a Swiss automatic movement with 25 jewels, dating from the early to mid-1960s. Felsa became well known for its Bidynator automatic winding system, and although I’ve serviced couple of ETA, AS, Seiko and Chinese movements, this was my first encounter with a Felsa. I had never serviced a Felsa 4000N before, making this restoration as much about learning as it was about bringing another vintage watch back to life.

First Impressions

The watch arrived in fairly rough condition.

The original crystal was completely missing, leaving the dial exposed for who knows how long. Unsurprisingly, the dial had suffered over the years, with plenty of spotting, staining, and general wear. While it would never be considered pristine again, I wanted to preserve as much of its originality as possible.

Without the crystal protecting them, the hands had also taken a beating. They had likely been bent while sitting loose in a drawer or perhaps during shipping as the hands rubbed against whatever was around them.

Fortunately, the movement still showed signs of life.

Unfortunately, it wouldn’t run for long. The seconds hand was catching on the hour markers, causing the movement to stop almost immediately. Thankfully, this was a straightforward mechanical issue rather than a fault inside the movement itself.

The expandable bracelet that came with the watch was equally tired—decades of accumulated dirt hidden between every link. While functional, it certainly wasn’t something I’d be keeping on the finished watch.

A Chance to Explore the Felsa 4000N

Every vintage movement teaches you something new.

This was my first encounter with the Felsa 4000N, and I deliberately approached the service with curiosity rather than simply rushing through it.

Even removing the automatic rotor was different from what I had previously worked on. As I continued dismantling the movement, I found several design choices that really stood out.

One feature that immediately caught my attention was what appeared to be a combined third and fourth wheel arrangement, sharing a common pivot. It isn’t a layout I’d seen before, and it made the gear train look noticeably different from many other Swiss automatics I’ve serviced.

The barrel design was equally interesting. Rather than using a completely separate intermediate wheel arrangement, part of the winding system is integrated into the barrel assembly itself while still retaining both the ratchet wheel and intermediate winding wheel.

Even the seconds wheel was unusual, consisting primarily of the extended pinion that drives the central seconds hand.

One of the biggest puzzles was the mainspring barrel. At first, I couldn’t work out how the mainspring was supposed to come out. Unlike most movements where the arbor simply lifts out once the barrel is opened, the Felsa uses a different design.

After a bit of careful observation, I eventually figured it out. The trick is to hold the arbor while rotating the barrel counter-clockwise, which releases the latch connecting the arbor to the inner end of the mainspring. Only then can the spring be removed safely.

What surprised me even more was discovering that the arbor isn’t really a separate component in the usual sense—it forms part of the barrel assembly itself. It was another clever engineering solution that I’d never come across before, and it’s one of those details you only appreciate once you’ve had the movement completely apart.

Whether these decisions were intended to simplify manufacturing or improve reliability, I couldn’t say with certainty, but they certainly made the movement memorable.

One of the reasons I enjoy restoring vintage watches is that every calibre has its own personality, and the Felsa 4000N definitely has one.

Cleaning and Reassembly

Once the movement was fully disassembled, every component went through cleaning before fresh lubrication was applied during reassembly.

Putting everything back together required more patience than expected.

The calendar mechanism, in particular, took several attempts before everything aligned correctly. Vintage calendar works often appear simple until you’re trying to reinstall every spring and lever in exactly the right order.

As is often the case, reassembly took considerably longer than disassembly.

An Unexpected Timegrapher Problem

With the movement fully assembled, I was expecting to see a healthy reading on the timegrapher. Instead, the display was completely snowy, making it impossible to get a stable measurement.

My first thought was that the movement had become magnetized during assembly, so I ran it through the demagnetizer. Unfortunately, the results were exactly the same.

After ruling that out, I started thinking about what else could be causing such a noisy signal. I decided to remove the balance assembly once more and give it a separate clean in lighter fluid. Once it had dried completely, I reinstalled it and tried the timegrapher again.

This time the difference was immediate. The snowy trace disappeared, and the timegrapher produced a clean, stable reading.

I’m still not entirely sure what was causing the issue. It may have been a tiny amount of contamination or dried oil on the balance assembly that interfered with its motion. Whatever the cause, it was a good reminder that sometimes the smallest components can create the biggest headaches, and that systematic troubleshooting often pays off.

Eventually everything came together, and the movement began running smoothly once again.

Cosmetic Improvements

With the movement running properly, I turned my attention back to the exterior.

A new acrylic crystal was installed, instantly transforming the appearance of the watch. Amazing how much difference a simple crystal replacement can make.

The hands and dial received only a gentle clean.

There was no realistic way to restore it to like-new condition, nor did I want to risk damaging what remained of the original finish. The goal wasn’t perfection—it was preservation.

Although the age-related patina remains, the watch now presents much better while still honestly reflecting its sixty-plus years of history.

I also replaced the dirty expandable bracelet with a simple brown leather strap, which suits the understated 1960s design much better.

Final Thoughts

The Felicia name may not be particularly famous today, but beneath the dial sits an interesting piece of Swiss engineering.

More than anything, this project reminded me why I enjoy restoring vintage watches. Every unfamiliar movement is an opportunity to learn something new, and the Felsa 4000N certainly delivered.

The watch still wears its age proudly. The dial has imperfections, and it will never look factory fresh again. But it’s once again a functioning automatic watch, ready to continue ticking after more than half a century.

Sometimes that’s the most satisfying restoration of all.

If you are interested in this watch, it is for sale in my eBay store.