After collecting as many serials I could find (still collecting ), I managed to derivate a list of serials and matching references and also a assumption of production numbers in the end.

Since there is are a lot of definitions of MKI , MKIc or MK IV out there, I tried to tie these classifications on serial charges and building dates.

(please scroll horizontal within the table on mobile devices – last edited 24/09/2020)

Enicar Sherpa Graph

Model Ref. Serial Range Date Production Numbers
Sherpa Graph MK I 1308 BaNCH 272.5xx- 272.9xx 5/60 500 watches
Sherpa Graph MK Ib 1308 BaNCH 409.2xx – 409.6xx 11/61 700 watches
Sherpa Graph MK Ic 1308 BaNCH 526.0xx – 528.1xx 4/62 700+ watches
Sherpa Graph MK Id 1308 BaNCH 561.7xx – 562.1xx 6/62 500 watches
Sherpa Graph MK II 072/001 601.5xx – 601.9xx
617.1xx – 617.5xx
246.1xx – 246.6xx
63(est.)
63(est.)
63(est.)
1.500 watches
Sherpa Graph MK III 072-02-01 641.xxx
835.1xx – 836.2xx
906.4xx
908.0xx – 908.8xx
940.5xx – 941.4xx

63(est.)
65(est.)
66(est.)
66(est.)
6/66

3.200 watches
Sherpa Graph MK IV 072-02-01 1.030.1xx  – 1.030.9xx
1.261.6xx – 1.263.4xx
9/67
11/68
2.700 watches
Total9.800+ watches

Enicar Aqua Graph

ModelRefSerial RangeDateProduction Numbers
Aqua Graph MK Ia 072/002 635.2xx – 635.6xx 63(est.) 500 watches
Aqua Graph MK Ib 072/002 706.5xx – 706.8xx
722.1xx – 722.5xx
64(est.)
64(est.)
900 watches
Aqua Graph MK II 072-02-02 906.9xx – 907.4xx 6/66 600 watches
Aqua Graph MK III 072-02-02 986.5xx – 987.3xx 6/67 900+ watches
Aqua Graph MK IV 072-02-02 (A)
1.070.2xx – 1.070.9xx
1.317.1xx – 1.317.6xx
1.321.1xx – 1.321.4xx
1.322.6xx
3/68
5/69
1.900+ watches
Total4.800+ watches

Enicar Jet Graph

ModelRef.Serial RangeDateProduction Numbers
Jet Graph MK Ia 072/002 626.7xx – 627.0xx 63(est.)400 watches
Jet Graph MK Ib 072/002 721.9xx64(est.)100 watches
Jet Graph MK II 072-02-02 907.1xx – 907.4xx
927.3xx
6/66
6/66
500+ watches
Jet Graph MK III 072-02-02
072-02-02A
986.8xx – 986.9xx
987.0xx – 987.3xx
1.069.9xx – 1.070.9xx
1.263.4xx –
1.304.9xx – 1.305.9xx
6/67
6/67
3/68
11/68
5/69
2.900+ watches
Jet Graph MK IV 072-02-02A 1.317.1xx – 
1.318.1xx – 1.318.9xx
1.321.1xx – 1.322.8xx
1.622.2xx
627.1xx
8/69
8/69
8/69
3.000+ watches
Total6.900+ watches

Enicar Super Graph

ModelRef.Serial RangeDateProduction Numbers
Super Graph MK I072/002 626.6xx
635.8xx
706.8xx
63(est.)
63(est.)
64(est.)
?
Super Graph MK II072-02-02907.1xx66(est.)?
Total?