If you have neither Cobalts VIIC/41 Mod nor SH3 Commander it is just a perfect carbon copy of the VIIC.
The VIIC/41 was an improvement over the VIIC in real life (mostly because of the greater diving depth). But due to lack of time (or whatever) the developers just cloned the VIIC and wrote another name on it. So if you got Stock SH3 theres no point in getting it.
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