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CC - any note when it changed to a solid brass case? The coiled case would be only slightly later than the Martini's coiled .577/450. Seems to me by the end of the 70's, they'd switched to solid brass - or was it mid 80's?

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coiled brass was available for a long time. take a look into the 1902 eley price list:







I am in doubt that this was only old stock. coiled cases were cheaper than drawn brass, compare it for example with the drawn 577/450 case