It doesn't look engraved,most likely acid etched.
You might add the closeup photos and extra info you posted on ebay,but it looks post 60's.
"Fire opal" a term used by someone who knows nothing about opals.Fire opal is an opal with a red/orange or yellow base color and may or may not...
The stones look like man made opal.
Experienced artisan or experienced hobbyist .... there is little difference as both can make good products or junk.
If the photos were in focus maybe someone could tell.....they look man made from a ball burr and dremel.
With reticulation every surface texture will differ from another.The process is somewhat random and exact textures cannot happen.
Nordic rune/fantasy piece made with reindeer antler.
Looks a bit like early Buck Rogers.
With the white at the crow's feet,it may be an older U.S. Navy Sea Cadet Corps badge.
With the new photos,the piece looks like a poorly cast and finished student piece.
The ebay pot is Size:1.75 " H x 3.5" W.which is larger than the OP'S.
3D laser scanning can reproduce any imperfection from the original model.The 7 holes on the base also look like they are for a "pin" chuck.
It doesn't look hand carved in the photos,probably modern and cnc router carved. link............ [MEDIA]
Samodorok finish is a "trade/advertising name for "reticulated finish",it is usually made with 835 or 800 silver.
http://www.thegemtrader.com/May14DiamondPage.htm
It's a natural diamond crystal nothing unusual, no cutting involved.
Looks like Australian jelly opal with weak color play,impossible to say what the red stones are.Testing the stones would be a good idea.
The "life ring" is Swedish Life Saving Society .......http://svenskalivraddningssallskapet.se/om-oss/det-har-ar-vi/in-english
Silver tone discussion here ............ https://www.antiquers.com/threads/pen-pencil-set.18312/#post-250017
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