Big or Small head?

Can you tell me if my coin is big or small head? Thank you!

Small head, it has the wide rim.

Thank you. It is less common than the big head, am I right? 

Apparently, however it could be that the variety was added some time after the page was originally created, then only a few people changed variety. Unfortunately I don’t have this information. Km doesn’t list a difference.

The page existed in 2011 with a single year line and no comment about big/small head. By 2016 it was still a single year line but with the comment “big and small head exist.”  The next I can find in from 2024 where it looks like it is today.  Between 2016 and 2024 this catalog reference was added to the page  https://en.numista.com/L106048 which had different numbers for big/small head.  Sometime after that this additional reference catalog was added https://en.numista.com/L106049 again with different numbers for big/small head.  The answer about which is less common might be found in one of those two catalogs.

My sentence was based on the slightly higher price in Aureo catalog according to the picture added in the comments section. 

Aureo#3; Cal#9; Variety Big Head: narrow rim (left in picture below)  MBC 3 SC10

Aureo#4; Cal#10; Variety Small Head: wide rim (right in picture below) MBC 5 SC  15