In Kultakeskus they call these maker's or 'my own' mark. If this product is found to be plated or ground wrong, it can be returned to the actual maker (= internal control mark).

The Kultakeskus responsibility mark was KKo/y from 1918 to 1932. Since 1933 they have used a lion-shaped mark. Due to Kultakeskus acquiring other precious metal manufacturing companies they also use additional responsibility and symbol marks. These can be found Tukes register.

 1 = Reino Malin until ~1975, Seppo Ollikka ~1975–1980s

B = Pekka Salmi

C = Konsta Saari

H = Esko Hietamies

J = Risto Linberg 1960s

P = Esko Viitamäki

V = Eino Laakso, Ville Laakso

v (sideways) = Markku Laulaja ~1978-2008

W = Olavi Lehtinen

X = Pena (Pentti) Niinikoski

Z = Heikki Kajander

UNIDENTIFIED

The following marks have also been used:

2, 3, 4, 5, 6, 7, 8, 9, 22
G, I, L, N, O, R, S, U, Y, Ö, Å

2

N

R

U