There should be a space after the 1st digit with the 4 and 5 digit serial numbers, and no space with the 6 digit numbers. The 1st digit indicates the year of manufacture for the 4 & 5 digit serial numbers, these were used from 1989-1999.

Will my guitars increase in value?

Therefore yes, your guitar could increase in value as an investment, but its unlikely unless the guitar had a high perceived value at the time of purchase and has now aged for a significant amount of time (especially if it is now deemed to be vintage).