a common question always comes up is:
"How old is my Wild Heerbrugg Instrument ?"

Wild used different serial number lists for different product categories and I was able to safe most of these books from getting scrapped.
So I know the serial nomber and the product category or if I get a picture, in most case I'm able to tell you the production year.

a rought overview you can also get on the two lists below for the theodolites and levels:

Theodolites: valid for the following types: 

Wild 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

Levels:  valid for the following types:

Wild 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