For her 13th birthday next month, I'm giving my granddaughter this vintage, 1940's Hamilton tank (known as the Ashley) that I've had for about 20 years. The small size should fit her wrist well, and hopefully it'll be a keepsake for her down through the years.
It's never been serviced since I've owned it and continues to run great. I'm a little leery of having it serviced before her birthday, because you just never know what might happen when the back of an old watch gets opened. So I'm thinking don't fix it until it's broken, and telling her mother that I'll cover a service if it ever stops working or if the winding starts showing resistance.
What do you think?