what’s this font ?

Plantain  Suggested by donshottype 
Plantin Headline Medium  Suggested by donshottype 

Stone Island is an Italian men's apparel brand from Ravarino that uses a compass logo.
Most likely custom letters for the company.
Similar to Plantain -- if compressed in width and top and bottom serifs pasted on the terminals for _S_

Plantin Headline Medium is closer:



Would need top and bottom serifs pasted on the terminals for _S_. No width compression needed. Various adjustments required.
Seems to be currently available only from Font Shop.
It's the middle weight of the three fonts offered under this name.

Don, It could possibly be a defunct type house drawing of Plantin. Where they stole the design and changed three characters to keep legal! Also FYI - it is on myfonts.com https://www.myfonts.com/fonts/mti/plantin/ they just keep burying the old favorites!