I liked a children's book about a robot in the 1970s but I just can't remember the name of it. Wish I could remember.

I added The Colonial Twins of Virginia by Lucy Fitch Perkins after my GR friend, Rosa, invited me to vote on it.  I cannot be absolutely SURE that this is the book I read in the 2nd or 3rd grade (1960-1962) but it is the closest fit I have found so far.
     Way back then I read one to a few books about twins who lived in a variety of places or times----NOT NOT the Bobbsey Twins!   I remember enjoying the book(s).  At some point in my adulthood I began to look for info on the book(s) and/or the author.
     Over the years I would ask librarians if they knew anything about the books and I would usually preface my question with "I am not asking about the Bobbsey twins".  You would be surprised (or maybe not) how often the reply would be ~"Could it be the Bobbsey twins?"
     When the web came along every so often I would try a search and FINALLY in the fall of 2017 a search led me to an Wikipedia article about Lucy Fitch Perkins:
https://en.m.wikipedia.org/wiki/Lucy_...
     My advice to all of you parents and grandparents out there:  Encourage your young readers to keep a list of the books they read from the their first "chapter book" (a term I learned in 2018).   I wish I had kept such a list. And if your young reader is 10, 12, 14, or older the same advice applies. I wish I knew exactly which Anya Seton books I read in high school.

I read Dick en Dallie en de ponies when I was eleven or twelve, a Dutch translation of the book by Ursula Bruns, and I absolutely loved it! I borrowed it from the local library, unfortunately :-(

I have had a look from time to time (I'm so glad the internet is there!) but I have only found one copy so far, and it was way to expensive for me.