This is the famous Goldbrokat violin e-1 string that was made famous by Jascha Heifetz in his solo performances. This was the brand of e-1 string that he used in conjunction with the Tricolore gut strings to obtain his unique tone. The string is a high carbon steel with a loop end for attaching to a fine-tuner. The string is available from Gamut only in the Medium gauge of .26mm, (.066).
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Although this string sounds quite wonderful (I mean, there's a reason Heifetz used it), it does not last long.
That was the string of the leader Gewandhause orchester Leipzig orchester leader.