Vintage Black Curly Persian Lamb Coat Jacket Mink (?) Fur Collar

This belonged to my Great Aunt (who died in her 90s, in the '90s). Very good condition for it's age and quality. Black lamb color is truer in the photo of the back, rather than the front of the coat which looks lighter and more brown than actual. Please note: I am not sure of the size but my best GUESS is a medium, maybe size 8-10 ?? The coat is thick so give or take a bit on these measurements but approximately: 20" from armpit to armpit 25" from shoulder to cuff 19" across tops of shoulders Slight damage on the pocket (see photos) that can be easily repaired. It is hard to notice unless pointed out. I do not know alot about furs and am honestly not sure if the collar is real mink (?). Also, it is made in the style that there is no closure such as a button, hook, ribbon, or clasp. It just hangs open. Please ask any questions and understand purchase is under acceptance of my transparency in the description limitations stated above. I apologize for not knowing more details but it is a great coat, with great history, and a previous owner who was a great woman. ;-) Thank you!