The DOM is 1915 and some engraving patterns changed that year.
It is a No. 5 with a list price of $210 which would be about $6500 today. Same in 1928 right before the Crash.
In 1933 the MSRP was $190 and dealer $160

No. 6 would have precious metal

[Linked Image from photos.smugmug.com]