Do I go for the complete 489 center or just a brand new sure grip?

oldkimmer said

.................3.31 WAS MADE IN THE LATE 50s.....b 4 the 741 case, but same as..........not a 489 case.........kim...........

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What more can you tell me about this case. I must have been missinformed. Is it the axakt same case as a 741, only older, does it have another name? Will i find parts for it if needed etc...

Thanks