I am wondering if someone could help me identify the time period and authenticate this Montblanc 146 pen I have. It was given to me by my father and I am under the assumption that he purchased it sometime in the 1970s or 1980s possibly. I notice that there is no "Germany" imprint or serial number on the clip washer or anywhere else that I can see so far. Did Montblanc ever make pens without any imprint on the exterior at any point? I have not opened the pen to see the plunger mechanism to see if there is anything stamped or imprinted internally. The nib seems legitimate and has a 14C (not 14K?) stamp as well as "Montblanc" and what seems like the number 585 below it, in addition to the large 4810 number. Also as you can see the reservoir window is slotted as opposed to completely clear. It seems like an authentic pen to me and I have perused some of the posts on the website about various production eras but I thought I might get some input from the FPN community. Hope I didn't go overboard with the pictures. Thank you kindly!