Moldova silver coin - need to ID ruler [opgelost]

Hello,

I have this pretty worn coin and need to ID ruler.

I couldn't find similar coin with letter S on 11 o'clock on obverse

Maybe Piotr II with a retrograde obverse legend (SIMPETRIWOIWO) starting with that S.  I think the letters that we can see (SIMP …. VO) might fit.

https://wcn.pl/archive/131616?q=Mo%C5%82dawia+grosz

I see finish to S, start with U or O…. On your example S is after the cross (that is asterisk on my coin, not cross)

Or, possibly, asterisk doesn't  divide start and end of the inscription 

Legend is written backward starting with S.🙃

Oh, I didn't correctly understand the English word retrograde in your message despite using it today when editing other coin in Numista catalogue:)

Do you know other examples of retrograde legends on Moldovan coins? Is it common?

I first looked in the WCN archive for a Moldavia coin with an S obverse, and noticed them on Piotr's coins, which appear to not be very common.  None were retrograde like yours.

I also just looked on acsearch, where there were 4 of Piotr's coins in a 2021 auction.  Again, none were retrograde.  I also noticed from these that the crescent and flower at the bull's mouth are in the opposite orientation (left/right) on yours, so it is a complete “mirror image” (everything is flipped).

Also different on your coin is the flower obverse at 12:00 in place of the normal cross. 

It looks like Peter I Mușat and the legend it's 

Here you have a better sample to compare with a slightly different legend.

https://monederomanesti.cimec.ro/moldova/PM/g2f_010.htm

These coins have many variants even some catalogued variants with legends reversed.

Looks like a pefect match (including the flower).

Yes, it looks correct. Thank you @Andy289and @tdziemia for your help!!!