These are considered 1st generation Stage Customs (6000 series) built between ~1995 - 2001. Harry is indeed correct in that the Stage series began circa 1979/1980, but for the current Stage Custom series (now in its 5th revision), this generation is usually referenced as the starting point.
From the serial number prefix (POI) on both badges, these two drums (tom & snare) were specifically built in 1998-02 (Feb 1998). Reportedly this generation was initially made in Japan before production was moved to Indonesia, but given the Indonesia badges and later production year here, there is little doubt to the factory where these were made.
The shells are a 8-ply layup of: 1 outer ply of Birch, 6 middle plies of Philippine Mahogany*, and 1 inner ply of Falkata. This layup continued through the 2nd gen (2001 - 2004 Standard & Advantage) and 3rd gen (2004 - 2008 Advantage Nouveau) with the exception Oak was used in place of Birch on 3rd gen matte finishes. For 4th gen (2008 - 2014 Birch v1) and 5th gen (2014 - now Birch v2), Yamaha changed to all Birch shells with 7-ply bass drums and 6-ply toms & snare.
A good resource to verify this (as well as obtaining details on specific model Yamaha drums in general) is Yamaha’s Drum Vault:
For model #, be sure to enter a hyphen (-) between the leading letters and trailing numbers stamped on the badge... e.g. the models for these two drums would be:
Tom: STT-610 (Stage Tom Tom, 6000 series, 10”)
Snare: SSD-065
As others have noted, there isn’t anything particularly unique about this generation that would command a higher price. To maximize their resale, ensure they’re clean and maybe emphasize 1st gen, single high tension lugs, and matching build year & month on all drums if applicable (i.e. factory matched set). Emphasizing great sound/tone and lack of composite/plastic Nouveau lugs (like used on 3rd gen) may also help. Definitely avoid discussing build location, wood species, lack of YESS mounts, etc. which can be more subjective and distract from positives.
Best of luck with the sale.
* Note: Although it’s common practice to call this wood Philippine Mahogany, it is more accurately Meranti/Lauan.