@Risto Yes, I'm in the beginning-middle of the process now. Feel free to take a look at what I'm working on:
www.typsim.com
I will agree with the sentiments expressed to date regarding marketing, it's essential to getting your project/brand off the ground. You need to determine what sets your brand apart from the rest of the pack (not just one other brand you think you could compete with) and ask yourself, "Why will consumers purchase my watch over the other options available?" This is, of course, unless you're independently wealthy and having people buy your watch doesn't matter. In which case, it doesn't matter.
The design process is fun but can be a bit aggravating, especially if you're intent on doing something different. Generally speaking the major watch factories available to microbrands are set up for one type of watch. I don't mean private label watches in which you brand a catalog watch but rather ODM (original design manufacturing). While that sounds like the sky is the limits, it's not. Should you want to deviate from that normal, you will face an uphill battle. Prepare yourself to negotiate engineering limits and material supply chains with maintaining your design intent.
Again, generally speaking, you can go to China or Switzerland for design, prototyping, and manufacturing.
China:
~USD 1000 for design concept work
~USD 5000 for prototype manufacturing
The breakdown is USD 4000 + tooling costs + (unit cost x quantity)
Tooling and unit costs are highly dependent on your watch design
Switzerland:
~CHF 10,000 for design
~CHF 10,000 for engineering
~CHF 5,000 for a functional prototype
One note about the prototyping in Switzerland, they only work in brass although it can be plated to be silver. Functional does NOT mean water resistant. And if you want a stainless steel prototype, guess what they do? They outsource to China!
Another note on the costs, depending on your completeness of design work and technical drawings, you can cut down and/or eliminate the design fee.
Should you want to go it your own and manufacture your own watch (excluding the movement) you're looking at some sizable startup costs. Here are a couple of the heavy hitters:
5-axis CNC machine: ~USD 134,000 not including tools, those are about USD 500 each. This also doesn't account for the USD 100/hr engineer you'll need to program, run, and maintain the machine
3-color Pad printer: ~USD 20,000 (not including cliches or ink)
Again, I will similarly note having a watchmaker on retainer or payroll is essential. You will need to stand behind your watches and you will need someone to do that work for you (if you cannot do it yourself). It's worth noting you'll need to prepare for after sales care with instructions, FAQs, repairs, warranty, spare parts, shipping costs, etc.
Anyways, good luck! When you make some of those sketches do share with the group. It'd be great to see them and hear how you're coming along.