Vaucher and Schwarz-etienne come to mind, for a bit higher end stuff
Dm783848hfndb
It's a very bad fake. Here's how an actual A Lange und Söhne chronograph perpetual calender looks like:
You can immediately see the colossal difference in quality. But if you want to be sure just look at the movement and then Google how an ALS movement looks like. You'll immediately see the difference. No to mention particular watch had a price of about 300k€. Is your uncle in the habit of such giving gifts?
Are you blooking for a particular style (dress, sports, diver, etc) and do you have a preference towards movement (quartz, auto, manual)?
The new longines conquest would get my vote. Versatile enough for most occasions, 100m WR and solid movement.
And is there a “more famous” watch that this Gevril is based on?
Probably the Franck Mueller long Island. It's not an exact copy but the numerals are similar to FMs signature look. The case shape and espicially the lugs are a close match.
Seiko has made a couple of tank style watches that could be an option. The SWR053P1/SWR054P1 or the sup250p1 for example.
Jomashop is currently running their pre-black friday discount. Though I'm not sure eif that is applied to their hydroconquest or if they're just on regular discount.
RGM could be a possibility. They've made custom pocket watches before.
Epos makes pocket watches as well. But I think they might be pretty much the definition of what you don't like. As they're mostly skeletonized and/or have have a see through caseback.
Aside from that they only other brands that come to mind are the likes of Patek, Vacheron and Bovet. Not exactly affordable.
There's no way I'd pay 20k for a ming but I'm not surprised at the price tag. With a title like "worlds lightest watch" I expected a number like that.
Huge credit to schwarz etinne as well. They've been producing amazing movements for a long time. Also goes to show that "in-house" isn't always the end-all be-all.
I'd recommend also posting in r/rolex. There are some pretty knowledgable people in there, when it comes to vintage and rarer/niches models.
What's your budget?
Breguet has the 3795, which includes a perpetual calender and tourbillion. They also have a double tourbillon, the 5345.
Cartier has the Rotonde de Cartier Grande Complication Skeleton. Which includes a flying tourbillon, a perpetual calender and a minute repeater. They also have a version with chrono instead of the minute repeater.
Tissot's Powermatic 80 models would be the first that come to mind. Although new, you're still looking at ~600-1.2k depending on the model (excluding the 18k gold line). You can get them for less if you go pre-owned or grey-market.
A mlre specifc budget would be helpful.