Answers.Body: <p>According to <a href="https://en.wikipedia.org/" rel="nofollow">Wikipedia</a>:</p>
  
  <blockquote>
    <p>In 1975, Duplo became its own product brand, with five sets made up
    exclusively of Duplo bricks.</p>
    
    <p>...</p>
    
    <p>In 1977, the Duplo name was dropped in favor of Lego Preschool.</p>
    
    <p>...</p>
    
    <p>The name Duplo was brought back in 1979, along with a new reworked
    logo.</p>
  </blockquote>
  
  <p>Although I haven't found this information yet (most people likely see this detail as unimportant), it is possible that LEGO started with putting DUPLO on the bricks either when they first came out (in 1969) or in 1975 when DUPLO became its own "product brand". They likely changed it in either in 1977 (when LEGO called it LEGO Preschool) or in 1979 (when they brought back the name DUPLO). </p>
  
  <p>According to <a href="http://lego.wikia.com/" rel="nofollow">Brickipedia</a>:</p>
  
  <blockquote>
    <p>In the Preschool range, new DUPLO bricks were introduced, including arches and the first DUPLO figures, which did not have movable limbs.</p>
  </blockquote>
  
  <p>Considering the above quote, it is possible that with the new bricks the DUPLO on the "knobs" (as you call them, however the proper name is a "<a href="http://lego.wikia.com/wiki/Stud" rel="nofollow">stud</a>") was changed to "LEGO"; this was in 1977 on.</p>
  
  <p>Source(s):</p>
  
  <ul>
  <li><a href="https://en.wikipedia.org/wiki/Lego_Duplo#History" rel="nofollow">https://en.wikipedia.org/wiki/Lego_Duplo#History</a></li>
  <li><a href="http://lego.wikia.com/wiki/DUPLO#Start_of_the_theme_.281975-1980.29" rel="nofollow">http://lego.wikia.com/wiki/DUPLO#Start_of_the_theme_.281975-1980.29</a></li>
  </ul>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2016-10-14T09:05:41.780Z
Answers.Text: Good awnsers. I estimate my "Duplo" blocks were bought around 1985, so it could have still been older stock floating around.  Thanks!
Answers.UserDisplayName: Diederik
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2016-10-13T17:13:30.170Z
Answers.LastActivityDate: 2016-10-13T17:13:30.170Z
Answers.UserDisplayName: Christian Sirolli
Body: <p>I've looked at some of the DUPLO bricks I grew up with, and compared them to newer ones. I've noticed that the knobs on the older bricks say DUPLO, while the newer ones say LEGO. </p>
  
  <p>When did this change? </p>
  
  <p><a href="https://i.sstatic.net/7EJqm.jpg" rel="noreferrer"><img src="https://i.sstatic.net/7EJqm.jpg" alt="Blue LEGO, yellow DUPLO"></a></p>
  
  <p>On the back of the yellow brick (not pictured) you can see writing "LEGO group"</p>
  
Tags: <duplo><vintage>
Title: When did piece markings change from DUPLO to LEGO?
UserDisplayName: Diederik
ThreadText: # When did piece markings change from DUPLO to LEGO?
  
  (Asked by: username_0 on 2016-07-27)
  
  I've looked at some of the DUPLO bricks I grew up with, and compared them to newer ones. I've noticed that the knobs on the older bricks say DUPLO, while the newer ones say LEGO.
  
  When did this change?
  
  [![Blue LEGO, yellow DUPLO](https://i.sstatic.net/7EJqm.jpg)](https://i.sstatic.net/7EJqm.jpg)
  
  On the back of the yellow brick (not pictured) you can see writing "LEGO group"
  
  **Tags:** duplo, vintage
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2016-10-13. Score: 2
  
  According to [Wikipedia](https://en.wikipedia.org/):
  
  > In 1975, Duplo became its own product brand, with five sets made up
  > exclusively of Duplo bricks.
  >
  > ...
  >
  > In 1977, the Duplo name was dropped in favor of Lego Preschool.
  >
  > ...
  >
  > The name Duplo was brought back in 1979, along with a new reworked
  > logo.
  
  Although I haven't found this information yet (most people likely see this detail as unimportant), it is possible that LEGO started with putting DUPLO on the bricks either when they first came out (in 1969) or in 1975 when DUPLO became its own "product brand". They likely changed it in either in 1977 (when LEGO called it LEGO Preschool) or in 1979 (when they brought back the name DUPLO).
  
  According to [Brickipedia](http://lego.wikia.com/):
  
  > In the Preschool range, new DUPLO bricks were introduced, including arches and the first DUPLO figures, which did not have movable limbs.
  
  Considering the above quote, it is possible that with the new bricks the DUPLO on the "knobs" (as you call them, however the proper name is a "[stud](http://lego.wikia.com/wiki/Stud)") was changed to "LEGO"; this was in 1977 on.
  
  Source(s):
  
  * <https://en.wikipedia.org/wiki/Lego_Duplo#History>
  * <http://lego.wikia.com/wiki/DUPLO#Start_of_the_theme_.281975-1980.29>
  
  > **Comments:**
  > **username_0**: Good awnsers. I estimate my "Duplo" blocks were bought around 1985, so it could have still been older stock floating around.  Thanks!  
  
  ---
  
  