Hello all and thank you to the Mods for waivering the 200 post rule so I can try and locate an OEM glass crystal for my early 1950's Longines President Coolidge Model. I am new here, but have bought one watch from Norman in November. My watchmaker has so far only been able to source a plastic crystal, but I would really like to put in an original glass Longines crystal or an aftermarket crystal from that time period that is glass. I will add a pic of the watch from my phone in a few minutes. Thank you again to the Mods for allowing me this chance and to all the knowledgeable members here who have unwittingly educated me so far. I am looking forward to continuing my education here for many years. McK