I've never found a cross-reference for Spiegel firearms, but I'd bet (a small amount) on Nobel as the manufacturer of a pump gun.
Look up the Marlin shotgun with the same model number.
There's a whole shelf of books on firearms in your library. Or you may find information on www.savagearms.com
This is really a Winchester model 1400.
Try contacting Browning via their website at www.browning.com
Mechanical licenses for "Spiegel im Spiegel" can be handled through Harry Fox at the link below; it is their song code S35483.
Unknown.
The Stevens 311 is a double barrel shotgun.
you may find some info at the savage arms website.This was the maker of your shotgun,savage/stevens.
It would depend on the model you are interested in. Here is a link for Automatic 16's.
If information has been published on the company, buy the book(s). Try Proofhouse.com.
Its an H&R Model 120
See #6 at http://www.marlinfirearms.com/CustomerSupport/faq.asp