The emblem on the shoulder straps of the personnel of the sea fortresses (?)

A very interesting and rare emblem in excellent condition. Nickel silver, stamping. For the first time , such fittings were installed on the cap of the arsenal companies of the Naval Artillery Corps of the 1855 model . It existed in this form for about a year and a half, as long as caps with coats of arms existed. In 1913, the emblem, completely identical to the one presented, was installed for pennants and flogs of commands and commandants of sea fortresses, while the order did not mention the introduction of metal emblems on shoulder straps. Nevertheless, from time to time such emblems appear on the market, and often found in the ground, so we can talk about the "unofficial" nature of its existence. Size 28*42 mm. Guarantee of authenticity. A rarity.