Welcome aboard. We could do with the model number off the caseback to identify the movement - e.g. E65062, E75362, E56059, E79362, etc - which will thereby allow us to identify the base movement..... and then hopefully identify a (cheaper) donor watch running the same base movement that you can swap yours out for.

F65362 is on the back of the case.
Thanks

OK, so that indicates the movement is the B65, which is based on the thermo-compensated ETA 998.332.

The only other watch I know of that uses that particular base movement is the Victorinox Classic XLS MT Ana-Digi. If you could find a used model you could easily cannibalise it for the movement and drop it into your Aerospace. I'm not sure how widely available these are these days but they first came out around 2008, so there may still be some on the Bay, etc. (I've not looked). Obviously there may be other watches out there that use that movement too, I'm unfortunately I don't know any of the top of my head. Hopefully one of the guys who knows quartz a lot better than I do will chime in soon.

The only place I know that MAY be able to supply brand new ETA movements is Otto Frei (http://www.ofrei.com), but TBH I've only seen mechanical movements available from them.

Problem with the Victorinox is that the lower display is not the same size as the Repetition Minutes and I wouldn't use it unless as a last resort. The Breitling movement has always been proprietary so the watch has to go back to Breitling to get fixed properly. Always a chance you might find a used one on ebay but I've not seen one in quite some time.

Ah, I didn't know that about the lower display on that particular calibre. Sorry OP, I tried!

Do you think it would fit at any rate - I would even be happy with the watch working with just the analog hands. I am content to run it with the digi display off.

Want to replace it with a factory new Breitling? Send it for repair. Breitling may well offer 30% off a direct purchase if they can't repair because the Breitling version movement is not available. You'll have to surrender the non-working Aerospace. I did this with an old Intruder.....3 years ago.

Desert Hiker

Problem is the Aerospace doesn't fall into that category of "can't repair" because they just install the upgraded movements.