Borgward Production Dates and Chassis Numbers.

 

Production date Isabella Saloon Isabella Coupé Isabella Combi P100 Big Six
June 1954
540001
-
-
-
October 1954
545427
-
-
-
October 1955
731725
-
230327
-
October 1956
1100187
-
233995
-
March 1957
?
Introduced
?
-
September 1957
1118566
346563
239063
-
October 1957
1120222
346630
239753
  
September 1958
1140015
?
?
-
October 1958
?
349165
248675
-
January 1959
1148458
365001
310342
-
February 1959
1149909
365242
310793
-
March 1959
1151631
365402
311434
-
April 1959
1153631
365593
312210
-
May 1959
1156210
365925
313018
-
1959
1158295
366188
313600
-
July 1959
1160690
366481
314318
-
August 1959
1162186
366659
314782
-
September 1959
1164560
366793
315541
-
October 1959
1167329
367000
316321
-
November 1959
1169943
367943
317196
-
December 1959
1172537
367452
317976
-
Total For 1959
24079
2451
7974
-
January 1960
1175325
367675
318612
1230007
February 1960
1177917
367920
319374
1230012
March 1960
1180444
368188
320409
1230016
April 1960
1183160
368491
321575
1230020
May 1960
1185471
368754
322439
1230027
June 1960
1188540
369071
322985
1230036
July 1960
1191120
369386
323489
1230050
August 1960
1192355
369559
323740
1230061
September 1960
1194655
369923
324189
1230125
October 1960
1196848
370234
324496
1230224
November 1960
1198620
370489
325024
1230406
December 1960
1199784
370612
325854
1230932
Total 1960
25181
3039
7242
925
January 1961
1500506
370714
325854
1230932
February 1961
1501665
370796
326349
1231337
March 1961
1502704
370885
326532
1231480
April 1961
1503929
370954
326814
1231859
May 1961
1505090
371002
327160
1232112
June 1961
1506080
371071
327608
1232313
July 1961
1507257
371111
327963
1232537
Total 1961
6751
397
2109
1605

Information from Der Rombus 2/94 and other sources.

This is from a 1960s Glasses Guide.