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Hello, just acquired 3 parker 51 aerometrics. All have gold-colored caps. Two were made in Argentina, and one in the US. The problem I have is that the ones made in Argentina do not have the gold fill content hallmarked. It just says Industria Argentina. I plan to restore and resell, so knowing the gold content would really help me in my listing. Did Argentina not hallmark the gold fill content, could these be gold plated and not gold filled? I believe they are gold filled, and if so, what level of gold fill do you think they are? The US made pen is in the middle and is 12 K GF. Based on the colors, I'm guessing the first pen on the left is 10k GF, and the last pen on the right is 16K GF, if they are gold filled. I welcome your opinions/knowledge on this matter.