I believe they were first produced in 1984.
Midway USA's Gun Stories - 2011 SIG 226 3-11 was released on: USA: 11 September 2013
Best left to a SIG trained armorer.
9mm
SIG sn's are not in the public domain. You will have to call them.
Yes.
50-500 uSD
250-700 USD
You will have to call SIG
No publishe sn data I know of. You can conntact SIG at 603 418 8102 and request a SIG OFFICIAL DATE OF MANUFACTURE CERTIFICATE for $12.95, takes about 2-3 weeks
12-20 rounds depending on caliber and magazine.
It depends on which exact version (there are several different versions of the 226). If it is in fair shape, it can be worth $300 to over $1000, depending on the model.
No, they are two very different models in terms of magazine size.