I recommend Seiko Monster, it is a classic, and very piggy bank friendly. You can go for the original monster, SKX781K1 for orange version while other color variant have different number.

Or you can also go for the new monster aka Seiko Sarlacc, with which you got a cleaner dial & better movement, at slightly higher cost. The orange version is SRP309K1 and other variant carry different number.

Or if you want something that's really unique and also retain value better (hopefully), get a Seiko SPR043K1, aka Seiko Spork. But this you need some bit of luck, as it is a hot cake & already discontinued.
