The Carmina lasts are all width specific - from my experience, you cannot get a narrow last made wide, nor a wide last made narrow. Rather they have lasts that are narrow or wide, with different shapes and toe boxes per last. What we currently carry are the following;
Simpson - a narrow last with a chisel toe. Reasonably extended in the toe box, and a reasonably narrow waist. E width.
Alcudia - much like the Simpson, but with more of an Almond Toe. E width.
Robert - A rounded Almond toe, E width. Officially it is the same width as the Simspon, but the extra room at the toe tends to make it more comfortable for wider feet.
Inca - a pointed toe, on our widest last, with a fairly wide waist. The most comfortable last we have for wide and flat feet. EE width.
Rain - Much like the Inca, but with a chisel toe. EE width.
Forest - a popular last in Europe, it is a standard width with a soft round toe, quite low in the instep, so high insteps can feel a little pinched in this last. E width.
Uetam - a new last for us in a loafer, it feels very similar to the Forest, if a shade narrower. E width.
Thanks for the info.
Which last do you think would be most comfortable for a foot with a high instep?