My watch is a rare 5136/1g. It went in for a Complete service and refinishing of bracelet which had to be sent to Geneva. So I’m fairly certain it went to henri stern agency also because the service estimate was from henri stern. But again I didn’t...
Don’t forget about the 5136 variants. IMHO the best version with great size and clean dial layout (bigger font/no shrunken numerals). Plus the fantastic bracelet.