By now, you probably know that the Jets’ unspeakable last-second meltdown last Sunday against the Raiders came exactly 50 years to the day after they lost an eerily similar game to their old AFL rivals, when Daryle Lamonica completed a 33-yard TD pass to Warren Wells with :01 left in the game, giving Oakland a 14-13 win at old Shea.

In so many ways — besides that hard-to-believe coincidence, of course — that was an appropriate celebration for this Jets season which, in addition to looking as if it’s headed full-steam ahead to 0-16, also commemorates an important benchmark in franchise history, one the team itself will never seek to memorialize — and with reason.

Because it was the 1970 Jets — exactly 50 years ago — that helped set the template for the “Same Old Jets” narrative that has shadowed, stalked and strangled the team for a full half century.

At the dawn of that 1970 season, hard as it may be to believe, if you were to lump the words “same old Jets” together, the connotation was shockingly different than we know now. Back then, it meant that things invariably would work out for the team in green.

Think of it: They’d outbid the NFL for Joe Namath in 1965. They gave the AFL its first Super Bowl win, in 1968-69, and the following year they had what was probably an even better team that was denied a repeat only because the AFL probably had the three best teams in football — the Jets, Raiders and Chiefs. The Jets drew the Chiefs in the playoffs. That was their misfortune.

Even things that, viewed through present-day context, seem like “Same Old Jets” moments really weren’t. Take the Heidi Game, which feels like something that completely explains the Jets’ hard-luck DNA. Only, when that game happened on Nov. 17, 1968 — when NBC pulled away from Jets-Raiders at the Oakland Coliseum with the Jets up 32-29, late, to show “Heidi,” only to have its switchboards light up when the Raiders scored two late TDs to win 43-32 — it wasn’t a woe-is-us loss for the Jets, it was an infuriating turn of events.

And by the way? The Jets got the best revenge possible, beating the Raiders in the AFC Championship game exactly six weeks later. That’s what blessed teams do.

The Jets were held in such high regard as the 1970 season dawned that they were given the high honor of co-starring in the first edition of “Monday Night Football.” Namath was at the peak of his powers, in terms not only of performance, but of durability: He’d never missed a start, despite myriad bumps and bruises. The Jets, in many ways, were the envy of pro football as the 1970 season dawned.

And then …

And then.

The Jets lost to the Browns in that “MNF” lid-lifter, a troubling harbinger. They eked out a win against the eventual 2-12 Patriots in Week 2, and then the floor caved in: six straight losses. On Oct. 18, Namath threw for 397 yards — and six interceptions — as the Colts exacted revenge for Super Bowl III with a 29-22 win, and also by breaking Namath’s right hand late in the game.

There was no way of knowing this, but that was really that for Namath. He missed the rest of the year and the first 10 games of 1971 with a serious knee injury, and never again was he even remotely associated with the word “durable.” Still, even without Namath, the Jets were good enough to beat two strong NFC teams in Minnesota (which finished 12-2) and the L.A. Rams (who finished 9-4-1).

But they also got creamed in the first-ever regular-season game with the Giants (22-10, Nov. 1 at Shea). The week after Namath went down, his replacement, Al Woodall, threw for 33 net passing yards in a 10-6 loss to Buffalo. And then, Dec. 6, the Raiders broke their hearts with Lamonica-to-Wells, the first of what became a familiar template of hard-luck-losses through the years for the Jets.

“It makes no sense,” Weeb Ewbank said of the Jets’ improbable loss. If he’d only known …

I wrote the other day about the Army and Navy football teams playing each year “for the championship of each other.” I’d be remiss if I didn’t add another remarkable rivalry in which that was literally the case this year, when the Merchant Marine Academy beat the Coast Guard Academy, 24-14, at King’s Point to win the 40th Secretaries’ Cup — the only game either of the academies played this year. And I’d happily point this out even if the triumphant Mariners weren’t led by my old freshman hoops coach, Mike Toop.

There have been few things in 2020 worth celebrating, but the emergence of @AnnieAgar as a reliable source of Twitter humor is certainly one of them. If you haven’t, check out her work, thank me later.

Tell me again how the Knicks have chased away all their fans, and I’ll show you the stack of hopeful emails that stuffed my in-box Saturday morning after the first exhibition game of the season. The loyalty — and relentless optimism, despite it all — is simply remarkable, as always.

It’s not possible to make a better documentary than the one R.J. Cutler put together celebrating the life — and lamenting the death — of John Belushi for Showtime. Just a staggering and stunning movie.

Jeffrey Moritz: Since Kyrie Irving has declared that he doesn’t speak to media minions, maybe we will no longer be subject to any more of his esteemed beliefs, like the world being flat. In the old days, once a reputed star began to become loopy, the Knicks would swoop in to trade for that player — usually at the expense of multiple No. 1 picks. I hope to one day recover from my lifelong Knicks nightmares.

Vac: You have done this to your own fans, Knicks decision-makers. Please make it stop. Please make the madness stop.

Bruce Welsch: Fire Gregg Williams? If that all-out blitz that lost the game for the Jets keeps them winless and the favorite to get Trevor Lawrence, they should throw a parade for him. In fact, if they get Lawrence and he makes the Jets a winning franchise, they should build a statue for him.

Vac: Knowing Williams, he wouldn’t mind either one a bit.

@MJGlenister: Go Navy! Beat Army! Signed, your five high school classmates that graduated from the USNA.

@MikeVacc: I’ve always said Army-Navy absolutely belongs in the same rivalry conversation as St. Bonaventure-Niagara.

Mike Sullivan: Gibson & Williams has a nice Wall Street law firm ring to it, and not two of the most infamous mistakes by coordinators in NFL history.

Vac: Bob & Gregg are unwitting founders of “Bad Calls R Us!”