How old is my Kern & Co AG Aarau instrument-Wild Heerbrugg

How old is my Kern & Co. AG Aarau

 
                                                                                       

 

Dating of Kern instruments is sometimes difficult because of two mainly
reasons:

pre 1900, instruments like levels and theodolites did not have serial
numbers
on drawing sets, they also used old items with old logos in newer sets (I
have a set where they used logos from three periods …)

So if your instrument has a serial number I might be able to tell you the
approximately production date.pre 1900:    no serial number
(first registered serial number is 16615 from Jan.16. 1899)
    1910        19500
    1920        23500
    1930        27500
    1940        30500
    1950        40000
    1960        73000If
not, you might use the following overview over there company logos to date your
instrument:
(based on my drawing sets and brochures)I divide them mainly in six categories
(all data are approximately since they used different logos in a single set to
use up there stock):

known as used from
Logo used on case
Logo used on instruments
Logo used on brochures, manuals, price list

1

1819 – 1885

no marking on instruments

2

1885 – 1914

early one without any marking 

later ones with the Kern trademark

(1891)

(1897)

(1914)

3

1914 – 1926

 

4

1926 –  1949

5

1950 – 1959

6

1959 – 1990

If you have additional information ore comments, please send them o me by
email.
I will be glad to add them to this site to share them with other collectors.Ore
if you have a set or instrument do date, please send m some pictures.I am
also interested to acquire new sets. So, please let me know if you have a set
ore instrument you do not need anymore
 

is this a Kern ? 

Dividers are marked with a "K"
and the case is marked with "Aarau"
Regarding the shape of the set, could it be a 

 

drawing sets from Aarau, but not from Kern
 

 Hommel – Esser , Aarau

Gysi & Co. Aarau 

J.Bossart , Suhr-Aarau Suisse

 
 

 
 

 
 

 

  

 

   

 

How old is my Kern & Co. AG Aarau instrument – Wild Heerbrugg

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