Heinrich Wilhem Kaemmerer (1809-1837) worked in association with Keibel in the the execution of Orders from 1836 to 1846. Although he is not recorded as a box maker, the firm of Keibel were the most famous gold-box makers in Russia in the first half of the 19th Century. Keibel is known to have produced a series of boxes for the Imperial court, with the maker's inscription and no other Russian hallmarks, as was customary for Imperial commissions. [Solodkoff, Alexander von, Orfèvrie russe (Fribourg, 1981) pp.132, 154, 210-11]
Jwan Winberg, was miniature painter to the Imperial court of Russia working in St. Petersburg during the reigns of Nichlas I and Alexander II.