I have no idea of value, being in Australia prices are very different.
As Tom pointed out, guns were not completed or shipped in order. The manufacture dates are not recorded only shipping dates. There is no doubt that the serial number was stamped in 1957. Most likely made and shipped in 57 also, a letter will tell you for sure.

My own opinion is number 3001 would be worth more also 3002 and 3003, possibly 3010 maybe a little higher.
I do not have a 41 of this type so for me I would not care if its first year, second year or third. Its the first type Model 41 that's the important point for me. With around 6000 guns fitting this the value is no different from the second or third type. My opinion only.
The condition is the value decider.
Cheers