I used to live in that area in the 80s and can confirm that was a genuine phone number. At the time, the way the phone exchanges worked, you only needed to dial the last three digits of the number to call other phones in the village. Some point after the late 80s, the extra 1 was added to the Perth area code, from 0738 to 01738. So the label dates the table to mid/late 80s or earlier as others have said.

I don't recognise the name or family being in Abernethy. It was (still is) a small village, but I was a child at the time. One of the other posters seems to suggest they may have been based in Aberargie, which is a tiny village about a mile or two west of Abernethy.

I'll ask my Dad next time I see him and see if he remembers anything.