A 1970’s index list telephone and address finder. A small compact object to handwrite your telephone numbers of friends, family and acquaintances plus their addresses. The alphabet, A-Z is listed on either side of the plastic slider. The slider acts as a magnifier so that the letters can be viewed more clearly. The slider is manually moved to the letter of the alphabet of the name you require. Press the big central button at the bottom and the address book springs open at the letter you have selected.
As you can see from the photographs here it also had wood effect this was because it blended in nicely sat on a table next to your telephone. If you had enough room, you may have had a phone table with a chair or bench attached.
The manufacturers of this item obviously felt that certain letters of the alphabet were not as popular as others and were not required to have a page of their own. The following letters all have to share a page: DE, FG, IJ, KL, PQ, UV, WX, and YZ
These days younger people do not keep address books as they have all the numbers stored in their mobile phones.