asking for info, I have a o series 1939 S/42 Mauser luger

[robbt]

hello, asking for info, I have a o series 1939 S/42 Mauser luger, i have told they are rare ?
only made a couple of months
this is my first and only luger, when i was given the luger it still had grease inside and the
rails were still blue , until I fired it , please post, I am new to lugers and still leaning.
many thanks,robbt