Very nice Bill My 137's do not have hair lines... I believe Unitrade does not recognize the hair lines...Maybe you should approach them and let them know about your hairline find.
Some plates are known as having hairlines more than other plates. For some old plates, those with hairlines were bent plates rather than flat plates. Chroming of plates from 1928 onwards helped reduce bent plate stress, wear and damage. However, war time economy plates and their overuse has resulted in more hairlines on some plates.
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