Now for something completely different!
You are looking at a guitar amplifier indicator lamp jewel. I call this the 'wavy gravy' jewel. This is hand made from a glass jewel. The jewel has multi colored flowers in the glass. The colors are mostly red and yellow/amber with some clear mixed in, but there may also be blue and green in the mix. Due to the way the glass is formed, each one of these is a one of a kind creation. If you want something specific, put a message in. Options are: Mostly red/yellow. Red/yellow with some blue. Red/yellow with some green. Mixed - a little of everything. I will do my best to send something that fits.
This jewel fits any 'Fender style' lamp assembly with the screw on jewel - these assemblies have also been used on many other amplifier brands over the years - email me with a picture of yours if you are not sure.
The picture is shown with the jewel lamp only (Fender amp not included). Your amp should have the assembly already - the original just screws off and this one screws on (if you need the assembly, or the #47 lamp, we have these available in our store). Larger quantities may be available for amplifier builders, etc. Also check our store for many other types of unusual jewel lamps. Thanks.