Can anyone please tell me which cutter or mold was used for this mickey mouse topper please?

Where can I find it to buy? 

Thanks in advance.

JB Cookie Cutters has one very similar. Google the company name and then search for Baby Mickey.

They can also custom make anything you need.

Thanks a lot Jamie for the quick response.

I will check them out right away.

This appears to be cut free-hand, not a cookie cutter.  Find a picture you like and print it out in the appropriate size.  Choose your background color - for Mickey, I would use black - and, using your picture as a templet, cut out around the whole figure.  Then cut your picture apart, by color.  Use each section as a templet.  Using corresponding colors fondant, cut out each piece and assemble onto your black background silhouette, using water or edible glue.

In case this makes no sense, here is a tutorial that will explain.  Good luck!

http://caketalkblogger.blogspot.com/2014/05/mickey-cutout-cake-topper.html

Thanks Sandra, you are right. Thanks for the link.

You are very welcome, @Ngozi ‍!  2D figures are rather time consuming, but are not really hard and are very effective.  Good luck!  Can't wait to see your cake!