Taking the lead from @LaRea - I've been rummaging through my stuff and have one (1) Mobella 818 key from a previous boat. If interested, PM me your address and I'll mail it to you.
There is only a finite set of numbers for Mobella lock keys - but enough so that you'd have to carry around a couple hundred keys to go from boat to boat trying to open them all. If you were a crook it would still be easier to just break the lock with a screwdriver.
The nice thing is, if you do know your key number and it gets lost you can get a replacement fairly easily.
And although it's been posted before, if anybody needs to find out what your key is, it's usually stamped on the back side of the lock visible by sliding the thumb lock up. That is, if it's not already on your key. In my case, the boat didn't come with the cabin door key, so the members here were invaluable in helping me find that number and get keys ordered.
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The nice thing is, if you do know your key number and it gets lost you can get a replacement fairly easily.
2018 Cherokee 39RL Land Yacht (Sorry...)