New and need help!

A good place to start is here . http://www.pipephil.eu/logos/en/lettres/le-encercle-lettre.html and http://www.925-1000.com/index.html

Pipephil is an excellent site. Since you have hallmarked sterling, this site may also be of help:
http://www.silvercollection.it/dictionarytobacconistA.html
Pipedia.org might also be of help

I can't be any help regarding hallmarks (bloody tobacconists not using standard silver marks, gets my goat). Other than that, they're lovely pipes, such a shame about the cracked stem. With a polish and a clean they'd be beautiful smokes.

Amber is a bad stem anyway. It is hard on your teeth. Just get a stem made of ebonite or vulcanite.

This the problem with amber stems. If the stem had not been snapped in the middle they can be repaired. Usually I carefully removed the screwed in end and remove the threaded end. Carefully file down the stem end and drill out the stem to accept the treaded end and then cement the new thread into the end thus resulting in a shorter stem. That option does not exist here as the stem has broken in the middle. You will more likely get a plastic faux amber stem back. As to the pipe itself I cannot quite make out the Hall Marks but that will give you the approximate age of the pipe. I would say it would be mid 1930 to mid 1950s. Amber itself makes an excellent pipe stem and 90% of the meerschaums I own have amber stems and they are easier on the lips and teaches you not to bite down on your stem. Getting new amber stems is an absolute headache these days although I am informed that someone in Chicago will make them for a price. During the 1930s a lot of these type of briar pipes were sold by regional tobacconists in the UK and would have been priced at slightly under Five Pounds. You are lucky that the case has not taken too much of a beating as they are normally the first thing to go. Where did you find it as these do show up on Ebay every so often.