Please note what I wrote in my previous input:
Qrt.S wrote:Maybe he made it 31.12.1889 but assayed it in 1890 ;-))))
Russian legislation did not force any registered master to assay at all, but if he aimed to sell the object, it could not be sold without having it assayed, approved and legally marked. That was the law. There are, however, a few exceptions among those private orders and orders from the court....
When an object was assayed, was up to the producer when he took it to the assaying office. Because it is impossible to know exactly when an object was made, the assaying year is commonly considered to be the "date/year" of manufacturing. Minor inconsistencies may occur like most likely in this case.