Hi Sxmni,
Now I have a better idea of what you are looking for.
It sounds like you want a watch that 'looks Japanese' and does not 'look Chinese' So, yes, I guess this would rule out a watch in kanji.
You also do not want to use hiragana because the edges are too round.
Well, then, yes, I guess this leaves you with only katakana.
14 ジュウヨン
15 ジュウゴ
Let us know how it turns out.
文太郎より