When a movie is in the theaters, and especially when it is up for an Oscar, the studios take every opportunity to to generate media attention. It's worth noting that Dick Boak refused to give any information on either the value of the instrument to Business Insider, who contacted him to confirm the story.

If you read this Pre-1900 Martin you'll get some documented information about the actual market value of the pre-1900 Martin parlor guitars--and you'll see that they are not highly valued.

You'll also see pictures of the instrument--particularly the neck and headstock--it says that the pre-1900 Martin guitars had a distinctive volute behind the nut(and there is big photo that shows exactly what a volute looks like). There is a place in the video clip where you can see the guitar from the back. There does not appear to be a volute on the guitar in the movie.

This would seem to indicate that the guitar smashed in the movie was not a pre-1900 Martin. For the record, I am not an expert of any sort on Martin guitars, but I do know a bit about Hollywood;-)