1920 Martin Acoustic 00-28

This is a Vintage 1920 Martin 00-xx. I have done a little research to determine the year (1920)and model (00) but I am not sure of the model.  It looks like other 00-28s that I have seen, but I am not an expert.  If anyone out there has more info, please let me know.  This guitar dates back to 1920 with a serial number of 15153. The guitar is in great shape and is FREE from any cracks, splits, or repairs! This is in 100% original condition. It looks like it was played yesterday and put in the case for the last 60 years.  The wood is in GREAT shape there is no splintering or damage of any kind. The case is also in great shape.  I was only able to put 12 photos up here and I have many more. If you have any other questions at all please feel free to send me a message. Thanks for looking and good luck bidding!