PCGS estimates that a total of about 20,000 of the 1938-D nickels carry this overmintmark variety, with fewer than half of those known in uncirculated grades
(link) -https://www.pcgs.com/news/1938-d-d-over-s-buffalo-nickel-varieties

Current PCGS pirce Guide List $165.00 ---Current PCGS Price Guide List $165 -- Buffalo Nickel (1913-1938) Values - PCGS Price Guide