Rules for "1500" Card Game? (Not a Known Title)

No widely recognized card game called "1500." Could be:

• A regional name for a known game (e.g., 1000, 500, Pinochle variants).
• A house-rule game targeting 1500 points to win.
• A misremembered name.

To identify it, share:

• Deck type (standard, pinochle, custom).
• Goal (first to 1500 pts? 1500-card deck?).
• Any unique terms/mechanics.
• Where you encountered it.

With details, I can find or reconstruct the rules.