In Dungeon World, a number of pieces of equipment and services are listed with prices. One such service is A custom item from a Blacksmith. It states the cost of this is Base Item + 50 coins.

Is a custom item something simple like plate mail with a character's name pounded into some corner of the armor? Or is a custom item something like plate armor with magical resilience to heat? I ask because I have a magical weapons list that I created that has suggested prices for magical items and these would conflict.

More than my personal custom stuff (which may well conflict with DW rules as I didn't write DW) is the fact that DW has its own set of example magical items, some of which would likely be worth more than 50 + base item cost (although suggested prices are not offered for the example magic items.)

This leaves me to wonder if I'm horribly misunderstanding what a "custom item" really means in Dungeon World. What, exactly, is a "custom item from a blacksmith"?