There's no such thing as a "Los Angeles" $100 bill. All US bills are printed in Washington or Fort Worth, and the westernmost Federal Reserve District is based in San Francisco, not Los Angeles.
In any case any legitimate replica will be required to have numerous obvious differences from a real bill including the word COPY or REPLICA clearly displayed on both sides.
Any copy of a bill that's so close to the real thing that it can't easily be distinguished goes by another name - counterfeit. Fakes of modern $100 bills generally won't contain the fluorescent security strip reading "$100" under UV light, nor will they have a good watermark or microprinting around Ben Franklin's image. However there are some very good fakes out there so you may need to use one of the special pens that changes color when applied to real or fake bills, and / or have it checked at a large bank.
Replica coins are required to have the word "COPY" stamped on them somewhere.
All replica coins sold in the USA are required to be marked with the word "COPY" in a conspicuous location on the coin. If a replica does not have the word "COPY", then it is a counterfeit.
Impossible to say without actually looking at it. Take it to a bank and they will be able to tell you if it is authentic.
cut it
The serial number and most times the letter on the bill.
The best thing to do is take it to a coin dealer.
Check the weight. A genuine U.S. Peace silver dollar should weigh 26.73 grams. If it's a replica, the weight will be off.
It's unlikely to be genuine. Millions of replica bills have been sold at gift shops and handed out as promotional items. Any printed after 1973 should have COPY or REPLICA worked into the design in small letters, but older replicas don't have that wording and can be difficult to tell from the real thing.The Related Link has a list of serial numbers used on replica bills.
2 Twenties Dollar bills 1 Five Dollar bill 1 One Dollar bill
The first federally-issued $2 bills were printed in 1862. You may have a privately-issued bill, a replica, a fantasy item, or something completely unrelated. Please post a new question with more information.
Take it to a reputable coin dealer who should be able to tell you if you have an authentic pattern coin. Most pattern coins are not authentic and therefore numismatically worthless. But if you have a real one it can be worth quite a bit.
The year should be printed on the front of the bill