Even a Csar tribute watch though I am not sure if the popularity of such men and the Romanov lineage.
St Pete became the capitol during his reign, correct?
If just a single watch one that could touch on Csar Peter, Issac, and the city without being overly busy? Limited to 300 watches?I
If broken in lines then a limited to 300 each of the topics your design team and CEO finalize.
The design themes could range from a tribute to the past, present, and even a hint of the future! You guys have your hands full but sound fun.
I do like the Beard Tax coin at the end of the link below. I bet the Ottomans were not cheery about that.