I have an F1 Series 3 that was my first "nice" watch. Even when I moved to more expensive autos, this F1 was always my grab-n-go when I was in a rush. Eventually, though the bumpers and crown guards wore down to the point where they looked awful. So, I eventually got rid of them entirely, and it looked better. But I found I stopped wearing the watch as much. I think it bothered me that the bumpers were gone. Like others, I did my research and found that the bumpers are apparently injection molded and the only way to replace them is replace the entire case for approximately $400USD, with the prospect that if I wore it enough, I would have to plunk down another $400 in a couple of years.
So, I got to thinking, could I drop the Series 3 movement into the Series 4 case? Short answer - YES!
I got a series 4 case off of ebay for $140. That included the case, bezel, crystal, spacer, crown and case back.
Here's how you'll need to combine the two watches:
- Series 3 - You'll need the movement dial and hands, stem, and bracelet/strap
- Series 4 - You'll need the case (with crystal and bezel), white plastic spacer (it's larger) and crown (crown tubes are not compatible)
- Caseback - They are interchangeable; I used the 4
- Remove the crown and stem from the S3 movement (pin in pinhole and pull)
- Unscrew the S3 stem from the S3 crown
- Screw the S3 stem into the S4 crown
- Remove the S3 spacer from the S3 movement
- Put the S4 spacer on the S3 movement
- Reassemble
That's it. The whole thing took me about 30 minutes, and a big chunk of that was figuring out which crown and spacer to use. Obviously, this isn't in keeping it original. But this does work as a budget solution and I feel with the S4 case, this old friend will last a very long time.