the LCW should read LGW, which stands for Laurens Glass Works. the 3 should be the date code but i don't remember them. you can look up glass markers marks for LGW and that should tell you how to read them.
i haven't kept up with the values but around 5 or 6 years ago the 26 oz amber mae west crush bottle were going for around $800 and up for one in like new condition. not sure about recent values. i never could afford one for my collection.