For custom collars, I have both a Paco collar (Custom Leather Dog Collars - Paco Collars) and Lizard Leather collar (Home - Lizard leather dog collars). Both are fantastic quality; the leather is very durable and soft and both have worn very well. Either I'm bad at measuring, or both collars run a tiny bit big. I personally don't like a tight collar so it's not an issue for me. I would highly recommend either of them. I know Paco does leather stamping if you want a name, and I think Lizard Leather does too.
i have recently redone the sizings on my collars as they used to come up a bit big.. but now should fit perfectly and all ive done in the last few months have all fitted on the middle hole as they should.. for measurements i need a flat tape measure round the neck flush.. no 2 finger gap.. i do a of that...
i do the balbutio thats got the name stamped on it.. you will find that on the first page on my website.. its my biggest seller of al time !!!
for a smaller puppy i can do the neck size on the smallest hole of 5 and then there is lots of room for growth !!