Fernando,
You are the boss here, I was merely trying to be helpful!
Here I list two of my more attractive enameled navajas. I suspect that both originated from Santa Cruz De Mudela around 1950. The unusually high level of workmanship points the finger at Julian Galvan or someone he taught. Perhaps Carlos can throw some light on them. They both have 6"carbon steel blades, liners and back spring, as well as bolsters (virola y rebajo).
The only legible inscriptions are Sevilla and E Leon (The rest was abraded out during grinding)) on the one with the Giralda and the other only bears the ubiquitous faux Toledo targetting tourists.
Cheers
Chris