Hi Fernando,
The photo from Dudley Pope's Guns depicts a heavy wrought iron gun barrel from the former Robert Forrer collection which is now at the Historic Museum Berne, Switzerland. All the wooden parts are late 19th century reconstructions but in correct historic shape.
I should say that the barrel with is pronouncedly reinforced muzzle and almost no staging present is really a very early piece, late 14th century. The sectional drawing shows the bore of very early form, and the measurements are taken from the Berne 1948 inventory. Forrer noted that the barrel was still loaded with powder and a lead ball, so he called the piece Bleibüchse (lead gun), in differentiation from contemporary stone firing barrels.
I am afraid that I could not find anything else about the weapons used at Aljubarrota but Rainer Daehnhardt might have some additional information.
Muito agradecida,
Miguel
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