Schermack Type III Scott 577

I began collecting in 1948 and have collected off and on since, alternating with coins and other things. Recently, I pulled my boxes of stamps from my closet and started reviewing attributions and providing attributions where I have not already done so.

I feel like a beginner!

I am posting this looking for verification that I have made the correct attribution.

Schermack Type III Scott 577

Design Size: 19.25 X 22.25mm
Perforation size: 1.25 x 4.75mm
Distance between perforations: 3.25 mm
Reference: https://www.theswedishtiger.com/577-scotts.html

Looks right.

Thanks!