An important difference to consider is the movements in Admiral and Grand Prize models. Some of the vintage Admiral models have Longines movements (34x, 35x and even 43X) and others Record based (5xx) movements. Grand Prize models from the 60's usually have Longines 34X or 35X movements. The Record based movements found a home in the Admiral models and in my opinion are well made and sound, However, they don't generally carry the same value in the marketplace as the Longines in house movements. From my perspective, I don't down value my Admirals with Record based movements. They are classic designs and carry the high quality Longines is known for.
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