Probably one of a series of about 10 small offshore supply vessels built 1955-7 by American Marine Corp, New Orleans for Tidewater Marine. Most have "disappeared" and two were definitely in Egypt in the 1970s.

Now operating as a cable-laying workboat.
http://client.cemselcuk.com/ekipmanlarimiz.html

23690 cannot be an IMO number!

IMO : 23690

Built 1957 U.S.A. 315 grosston
owner : Ortadoğu Denizcilik Kurtarma ve Sualtı Ticaret Limited Şirketi İstanbul Turkey.