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Also question is, how can you tell the difference between a 60 Amp and a 100 amp service?
Make sure to locate this panel and check what the electrical service is. If there is only 60-amp service, the main breaker will say '60' on it. If it's 100-amp, it'll simply say '100'.
Regarding this, can I put a 200 amp breaker in a 100 amp panel?
You cannot put a 200 amp main breaker panel on a 100 amp service, unless the service is protected at 100 amps.
Subpanel main breaker A main breaker on a sub-panel is not necessary because this is in the same building (if you are in a different building then NEC 225.31, 225.32, 225.33 apply). That said, having a main breaker in the sub-panel is also acceptable.