few H&R 929 questions

I got a H&R 929 6" the other day for $85 only problem was the ejector setup needed work it was cut down bent and missing springs. But in the quest looking for parts I found a Serial number break down and mine starts with a S42### saying it was a 1956. Further reading is saying that up till 1958 the cylinder would just slide off and in 58 you had to pull the screw in order to remove the cylinder which is how mine is set up. So do I have a 56 or a 58? thanks in advance
 
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