Hi,
The only goldsmith – jeweler matching initials is
Abovich Yavno Zelmanovich
Gold and silverware shop, merchant, mentioned 1909.
In regard of marks I think we tend to idealize them (unless it`s obvious they are faked).
There are many examples of badly struck marks and simply referred to ``the assayer had a bad day`` (again, if everything else is OK).
Please reconsider when the marks were struck. I think they were struck randomly BEFORE riveting, and later care was not taken where to drill the holes (they could have been drilled with the brooch rotated to leave marks intact). But again, we seem to be more meticulous than silversmiths at the time. Duty was paid. Marks are not obliterated and why care where to drill holes; to make collectors happy in the future?
(I suppose the assumption holes being drilled before assaying is based on the fact left side of the rim is missing. But it`s a technical detail proving just the opposite, when drilling the hole the rim falls over the depression and has no support underneath).
Moreover, their businesses are not perfectly documented. The brooch was die stamped – pressed (as mentioned above). The die is profitable if many items are made, but it was already 20th century and more affordable jewelry was made. Guilloche and diamond setting was probably even done by another maker – they had workshops but they were merchants and traders (specifically mentioned for Abovich Yavno Zelmanovich). Or guilloche was attached later by somebody else who found fitting guilloche. We`ll never know.
In conclusion, I think the brooch is genuine, cannot be sure about the maker, though. And no proof guilloche was there from the very beginning or attached later.
4. Абович Явно Зельманович
Владелец магазина золотых и серебряных изделий,
купец, упоминается в 1908 и 1909 годах. С.-Петербург.
Инициалы па клейме: ЯА, Я З А
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