vindog,
Your 1910/14 was produced in the post WWI era. Many of these .25 caliber examples, from this period do not have the Mauser banner on the side plate and most early .25s were not stamped on the right side at all. Without pictures I cannot say if it is a 1910/14 new model or a 1910/14 post war standard as these models overlap during this period. I believe many were assembled from parts that were in inventory after the war. Some believe production of the .25 caliber halted during the last years of WWI and I tend to agree. Far too many .25 caliber pocket models are marked with the circled triangle for them all to have gone to Portugal. The actual meaning of the marking is not known. As far as I know it was a unsupported theory formed because Portuguese lugers have a similar marking.
Regards,