1988 Post

According to ChatGPT if you've not checked.

If you're looking for a tuna door hinge for a 1988 Post sportfisherman, the original hinges are generally custom cast stainless-steel marine hinges, and Post did not use an off-the-shelf part on many boats from that era.

Your best sources are:

1. Post Yachts Owners Forum (or owner groups) – many owners have spare hardware from refits.
2. Marine Hardware, Inc. – they manufacture heavy-duty cast stainless hinges and may have a match or can identify yours.
3. Taco Marine – another source for heavy-duty transom door hardware.
4. Salvage yards such as Marine Surplus & Salvage or Minney's Yacht Surplus often have original Post hardware.

There are also discussions among owners indicating that many tuna doors require offset or long-throw hinges because of the curved transom, so a generic strap hinge often won't work.