Model 53 questions

[ndbass]

Can any of you guys tell me what year mine was made? It's serial number k444377 and any idea what it's worth? It confess with the original box in decemt shape, frayed edges but still squared. And comes with only one chamber wheel with the inserts which i think are for the magnum rounds. By the way, how can i tell for sure if it is the magnum chamber or not? Fun seems to be in mint condition. Not sure if it's been fired before, but doesn't look like it had been much

Thanks!