This is a Dennison Bogie Book edition that rarely is offered for sale. This 1916 copy looks to be in quite good condition. For some reason, every issue from 1916 that I've examined has been in poor to very good condition only. Dennison seemed to have a problem that year ensuring the covers stayed stapled to the pages. On my Relative Scarcity Index, this merits a "2," with a fair market value of $675.
05/21 Update: Given the condition, I feel the result of $510 is quite strong!