From a recent estate sale- I do not know anything about slides- but they look to be in good condition with no damage to slides.  The matting and the cover do have some age spots and cover has name "Nel" written in pencil on cover:
Souvenir packet of 6 Slides from the Holy Land.  Package reads "Colour Slides from the Land of the Bible."  "Gethsemane Church of all Nations Jerusalem." 
From Photo Studio Shamieh (with a 4 digit telephone number - if that helps date it).  Star Street, Bethlehem. 
Slides are titled:
197 Jerusalem Gethsemane Grotto
179 Jerusalem Olive Tree (Gethsemane)
193 Jerusalem American Dome Gethsemane
157 Jerusalem St. Mary Chruch
150 Jerusalem Golden Gate
192 Jerusalem Gethsemane Alter of the Church
Email for additional photos.
Item will be carefully packaged and promptly shipped.  From my smoke free home.