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A frequently asked question is, "How old is my Wild Heerbrugg
instrument?".
In some cases this is a very simple questions to answer, in others much
detective work is needed.
There are a lot of different serial number lists. The following data belong
to Levels and Theodolites and are estimated, not in every case
actual .
valid
for the following types:
T0,
T05, T1, T10, T12, T15, T16, T2, T3, T4, RDS1, RDH1, TC1, T1000, T2000(S),
TC2000
| first |
last Serial no. |
produced till the Year |
| 0 |
5000 |
1934 |
| 5001 |
10000 |
1940 |
| 10001 |
20000 |
1948 |
| 20001 |
30000 |
1951 |
| 30001 |
40000 |
1953 |
| 40001 |
50000 |
1955 |
| 50001 |
60000 |
1956 |
| 60001 |
70000 |
1957 |
| 70001 |
80000 |
1959 |
| 80001 |
90000 |
1961 |
| 90001 |
100000 |
1962 |
| 100001 |
125000 |
1965 |
| 125001 |
158000 |
1969 |
| 158001 |
176000 |
1971 |
| 176001 |
200000 |
1974 |
| 200001 |
250000 |
1978 |
| 250001 |
300000 |
1981 |
| 300001 |
325000 |
1985 |
valid
for the following types:
N0, N05, NK05, NK01, N1, N10, NK1, NK1, NK10, N2, NK2,
N01, NK01, NA1, NAK1, NA2, NAK2, N3, B3, K2, RK1, NA0, NAK0, DM1, GDM1
| first |
last Serial no. |
produced till the Year |
| 0 |
5000 |
1931 |
| 5001 |
10000 |
1938 |
| 10001 |
20000 |
1946 |
| 20001 |
30000 |
1949 |
| 30001 |
40000 |
1951 |
| 40001 |
50000 |
1954 |
| 50001 |
60000 |
1955 |
| 60001 |
70000 |
1956 |
| 70001 |
80000 |
1957 |
| 80001 |
90000 |
1960 |
| 90001 |
100000 |
1961 |
| 100001 |
125000 |
1964 |
| 125001 |
150000 |
1966 |
| 150001 |
175000 |
1968 |
| 175001 |
200000 |
1970 |
| 200001 |
230371 |
1972 |
| 230372 |
330371 |
not used |
| 330372 |
400000 |
1977 |
| 400001 |
500000 |
1981 |
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