You are correct it is Antoninus Pius, however there isn't enough reverse detail to attribute a RIC number. Maybe someone with better eyesight than I can tell you more.
I couldnt find an obverse die match with the legend breaks but they are unimportant for the ID.
Antoninus Pius, Sestertius, after 145 AD, Rome. 24,11 g, 30mm. ANTONINVS AVG PIVS PP TR P COS IIII, laureate head right / S-C, Securitas seated left, holding sceptre and propping head on left hand (sometimes a flower under chair). Cohen 757, RIC 782.
Does this match? I'm worried that the metal might be wrong. (brass)
Disclaimer: While a tremendous amount of effort goes into ensuring the accuracy of the information contained in this site, Coin Community assumes no liability for errors. Copyright 2005 - 2026 Coin Community Family- all rights reserved worldwide. Use of any images or content on this website without prior written permission of Coin Community or the original lender is strictly prohibited. Contact Us | Advertise Here | Privacy Policy / Terms of Use