Potential Edward Penny Reverse Legend Error

[Yucksha]

Hello,

I received the attached coin in an unidentified auction lot today and am confused by the reverse legend. To my eye it is a Group 3 (but this I am not sure of and need to spend more time having a closer look).

I think the reverse reads CIVI / TAN / CAN / TOR . Where the error is that usually TAN reads TAS.

Is this an error that comes up? Maybe the lower literacy when the coin was struck caused this?

Thanks for any help or information you can provide.